There are several reasons as to why the scientists believe that the Earth is older than the age of the oldest rocks. One of those clues is that the oldest rocks do not correspond with the estimated age of the formation of the planets in the Solar System, thus the Earth as well. Another one is that the Earth was initially hot, gassy and liquid, and it took millions of years for it to cool off, so only after its surface cooled off enough, the Earth got its first rocks. The rocks are also not staying static, but instead they move because of the tectonic movements, so over the course of millions of years, they weather, erode, sink, subduct, all of which can wipe them off the face of the Earth, so the younger ones remain.
The age of Earth is estimated by radiometric dating techniques that measure the decay of radioactive isotopes in rocks. This method, coupled with other geological evidence, suggests that Earth is over 4.5 billion years old, with the oldest rocks found being around 4.404 billion years old.
Notably, evidence for an ancient Earth is found in rock layers or strata, which, akin to the pages of a history book, record past surface events. Embedded within these layers are fossils that trace the evolution of life from organisms that existed billions of years ago.
The technique known as radiometric dating is crucial in this determination. It involves measuring the decay rate of isotopes from their original 'parent' isotopes into 'daughter' isotopes. This decay occurs at a predictable rate, acting as an atomic clock that allows scientists to calculate the age of rocks, providing evidence that the Earth is over 4.5 billion years old.
Moreover, the oldest known rocks on Earth, found in Australia, are mineral crystals that are at least 4.404 billion years old. This signifies that, while Earth's surface rocks may be younger due to geological processes like erosion and recycling of crust, the planet itself must be older. Given that Earth cannot be older than the solar system, its age is estimated to be between 4.4 and 4.57 billion years.
Which of the following is a new technique used by poachers in Central Africa?
Poachers on the hunt for ivory have stepped up their use of poison arrows and
spears.
Poachers are digging huge holes as traps for animals in the jungle.
Poachers have new cameras and GPS systems to track animals in the jungle.
Poachers are using other wildlife as lures and bait for the animals they hunt.
Answer:
Poachers have new cameras and GPS systems to track animals in the jungle. ( third choice).
Final answer:
Poaching techniques in Central Africa include traditional methods like poison arrows and spears, and potentially newer methods involving advanced technology. Despite conservation efforts, including the establishment of national parks and community-based tourism, poaching remains a significant threat to local wildlife.
Explanation:
Poachers in Central Africa are continually developing new techniques to illegally hunt wildlife, such as elephants, for their ivory and other valuable parts. Traditional methods have included the use of poison arrows and spears, which are efficient and silent, aiding poachers in avoiding law enforcement. Although the question does not specify which method is new, historically, the use of poison arrows and spears has been prevalent among indigenous hunting practices, such as those of the Hadza men who use poisoned arrow tips crafted from the desert rose plant sap. With advancements in technology, it is plausible that poachers might also now be using new technologies like cameras and GPS systems to track animals more effectively in the jungle. Unfortunately, no matter the technique, the poaching crisis continues to pose a severe threat to the region's biodiversity and has led to the near extinction of many species.
Various conservation efforts have been put in place to protect these endangered species. Initiatives such as setting up national parks and involving local communities through tourism can help in providing alternative incentives to safeguard wildlife. However, poaching persists even in protected areas, making the fight against illegal hunting an ongoing challenge.
Which is NOT an example of how East Africans use the many lakes in the region? Question 6 options: to support agriculture to provide ports to the ocean to make hydroelectric power to provide transportation
Answer:
to provide ports to the ocean
Explanation:
East Africa is a region that has several large lakes, located on the line of divergence between the Somali and Nubian plates, better known as the East African rift. These lakes are very important for the people living in the region. They are very rich in fish, so they provide lot of food. Because hey are large, they are also used for transportation and trade. There are other usages of them as well, such as the production of hydroelectric power, and providing water for irrigation of the agriculture. These lakes though are not connected to the oceans, so the ports are not providing any access to the oceans.
Answer:
to provide ports
Explanation:
from the book " east Africa is known for its many lakes and rivers, which are : hydroelectric power, fishing transportation, supporting agriculture, and even tourist attractions, as well as supporting natural ecosystems"
advantages and disadvantages of television dialogue
Answer:
Advantages
1. In this busy life, television can be the easiest source of entertainment. 2. By watching news channel, we get updated with the things going around the world. 3. Channels, like Discovery, gives information about Wild life. 4. Watching quiz shows can increase our knowledge. 5. By watching recipe channel, we can learn many recipes.
Disadvantages
1. Adult scenes, frequently shown on television, will have bad effect on children's mind. 2. Children's who are addicted to watch television instead of playing outdoor games, are more prone to Obesity. 3. Watching television will have bad effect on our eyesight. 4. Due to television, we don't prefer to socialize with our friends and relatives. 5. If people relate their own story with some character, it can have bad impact on their own life.
The correct answer to this open question is the following.
This is my dialogue:
Peter: Do you watch TV?
Danny: Sometimes. My parents do not like watching TV.
Peter: Why is that?
Danny: They say TV manipulates people.
Peter: But it is a way to spend time watching funny movies and cartoons.
Danny: But it is also a wat to watch sensational news, violence and adult content.
Peter: Well, that is true...sometimes. Buy TV programs also teach you something. For instance, on the PBS channel, you can find cultural programs. Some channels show you the history of humans, or even the way animals live. That is educative.
Danny: I know, but my mother sometimes watches other shows that are so boring, with no real content at all. Just evasive information to distract people and make them forget about important things. And there are also too many advertising adds that are always selling something "new," promoting consumerism...
What are the four major types of landforms?
A: mountains, hills, plateaus, and plains
B: plateaus, valleys, peninsulas, and oceans
C: mountains, valleys, rivers, and islands
D: canyons, hills, basins, and plains
Answer:
A: mountains, hills, plateaus, and plains
Explanation:
The four major types of landforms include mountains, hills, plateaus, and plains.
This ecosystem is common in northern China. This is a dry climate which is home to short shrubs, sheep, goats, and Mongolian Gerbils.
Which of the following ecosystems is described in the paragraph above?
A.
Tundra
B.
Highlands
C.
Mediterranean
D.
Desert
Answer:
D. Desert
Explanation:
The northern part of China is dominated by dry climate. Because the climate is very dry, the landscape is dominated by deserts, with the Gobi desert being the largest one. Unlike the stereotypical desert, the deserts in this part of China are not sandy, but mostly rocky, and apart from being hot and dry, they are also very cold and dry in the winter period, thus classifying them in the cold deserts type. In fact, the Gobi desert is the northernmost desert in the world.
The correct option is C. Mediterranean, as the described ecosystem aligns with its characteristics of a dry climate, drought-resistant vegetation, and grazing animals like sheep and goats.
The ecosystem described in the question is characterized by a dry climate, which is typical of the Mediterranean biome. This biome is known for its hot, dry summers and mild, wet winters. The vegetation in Mediterranean ecosystems often includes drought-resistant plants such as short shrubs. Additionally, the presence of animals like sheep and goats is consistent with the grazing animals found in Mediterranean regions. Mongolian Gerbils are also adapted to arid conditions, further supporting the classification of this ecosystem as Mediterranean rather than Tundra, Highlands, or Desert.
The Tundra (Option A) is characterized by cold, treeless plains with perma frost and low-growing vegetation, which is not consistent with the dry climate described. Highlands (Option B) typically refer to mountainous areas with varying climates depending on altitude, which may include forests and grasslands but are not specifically dry climates. Lastly, Deserts (Option D) are indeed dry but are typically much more arid than Mediterranean ecosystems and do not support the same type of vegetation or animal life described in the paragraph. Therefore, the Mediterranean ecosystem is the most fitting choice."
omission of articles all points with examples
Answer:We do not use articles in front of the name of the subjects, such as Maths, Biology, economics, etc.
> I hate the fact that Mathematics is his favourite subject.
> Economics as a subject is very interesting.
> I was asked to opt for computers by my teachers.
Explanation:
If China is forced to import massive amounts of food, what is the most likely consequence? Select one: a. The state of Chinese agriculture does not affect the rest of the world. b. Poor countries will benefit from the larger amount of goods flowing into China. c. Demand for food will rise, driving up prices around the world. d. The United States will refuse to trade with China.
Answer:
The most likely consequence that would occur if China is "forced to import massive amounts of food" would be that the "demand for food will rise", driving up 'prices' around the world.
Explanation:
If a country as big and as populated as China is forced to import massive amounts of food owing to the shortage of food produce within China or due to some other reason, the demand for the food would automatically increase giving a reason to the food-producing countries to increase the prices of the food owing to limited stock and supply of food at any given time.
After World War II, Japan’s economy _____.
grew faster than that of any other nation in the world
was expanded through military imperialism
was completely controlled by the United States
returned to its historical isolation
Please help!
Answer:
After World War II, Japan’s economy grew faster than that of any other nation in the world. - first choice
Answer:
Grew faster than that of any other nation in the world.
Explanation:
Before World War II Japan had started to modernize their economy to catch up with the Western countries. WW II was a set back in this plan, but their recovery was followed by fast growth.
Star 1 is 18 light years from Star 2 and 34 light years from Earth. If Star 2 explodes as a supernova, in how many years would the explosion be seen from Earth?
18
34
52
70
Final answer:
The supernova explosion of Star 2 would be seen from Earth 52 years after it occurs, as the light from the explosion would first reach Star 1 before traveling to Earth, combining the distances to 52 light years.
Explanation:
If Star 2 explodes as a supernova, we can determine how long it will take for the explosion to be seen from Earth by considering the distance light must travel. Since Star 1 is 18 light years from Star 2 and 34 light years from Earth, the explosion of Star 2 would have to be observed at Star 1 before it could be seen from Earth.
The light from the supernova would first have to travel the 18 light years to Star 1, and then travel the remaining 34 light years to Earth. Since light travels one light year per year, the total time to see the explosion from Earth is the sum of the two distances: 18 light years + 34 light-years = 52 years.
Therefore, the explosion of Star 2 would be seen from Earth 52 years after it occurs.
The ancient Egyptians did not have _____.
A: written language
B: organized government
C: flood control
D: cities
Answer:
They did not have flood control at first but then organized it same with organized government
Explanation:
The statement that the ancient Egyptians did not have a written language, an organized government, flood control, or cities is inaccurate. They had hieroglyphs for writing, a Pharaoh-led government, Nile flood control systems, and established cities like Thebes and Memphis.
Explanation:The ancient Egyptians indeed had a written language, an organized government, flood control, and cities. The ancient Egyptian's written language was the hieroglyph, which were pictorial characters used in their writing system.
They had an organized government led by a Pharaoh. As for flood control, they constructed ingenious irrigation systems to manage the annual flood of the Nile River.
Additionally, ancient Egyptians were known for their creation of large, structured cities such as Thebes and Memphis.
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The Permian Period lasted from 299 Ma to 251 Ma. This means that the Permian Period lasted _______ years.
No choices to choose from!
Answer:
48 years.
Explanation:
The Permian Period lasted from 299 to 251. Note that both are Ma, which means that you can just subtract 299 with 251:
299 - 251 = 48
The Permian Period lasted for 48 years.
~
Answer:
48 years.
Explanation:
The Permian Period lasted from 299 Ma to 251 Ma. This means that the Permian Period lasted 48 years.
what is a multicultural nation
Answer:
a state made up of distinct cultural groups
Explanation:
the other answers including "nations" are trying to msguide you, just look for the most right answer.
edit i just did the quiz and its right
All of the following climate regions are labeled on the map below except __________.
A.
humid subtropical
B.
tropical wet
C.
highland
D.
arid
Answer:
A. humid subtropical
Explanation:
Central America has several types of climates, most of which are part of the tropical climates. In the northern part of the region there are arid and semi-arid climate types, thus it is a region dominated by deserts and chaparral. The central part, stretching like a line in the heart of the region is where the highland climate is present, as this is the part of the region that is the highest in elevation. The southern part of Mexico, and the majority of the southern half of the region are dominated by tropical wet climate types, with slight variations, as some do not have dry season at all, while some have short lasting dry seasons.
Answer:
humid subtropical
Explanation:
Both the United States and Canada moved _____ into the frontier.
A) North
B) South
C) East
D) West
Answer:
D) West
Explanation:
Both the United States and Canada moved West into the frontier.
A rock inclusion in a basalt lava flow is dated at 56 Ma. This means the lava flow must have occurred _______ 56 Ma.
Answer:
after
Explanation:
The rock inclusions are older than the rock that is surrounding them. In this case, we have a rock inclusion that is dated to 56 Ma. It is an inclusion in basalt. This means that the lava flow, as it was moving in that area managed to get the rock inclusion, and as the lava started to cool off, it consolidated and trapped the rock inclusion in it for time to come. This makes up for a very interesting appearance of the rocks, as there is the basis, being all from the same type of mineral, and then inside of the uniform rock mass, there is a totally different smaller piece of rock sticking out.
Answer:Unlike catastrophism, _______ states that mountains formed slowly over time.
William Smith was working as a surveyor in the late eighteenth century. He noticed that certain fossils were found in certain layers of sedimentary or igneous rock, that the same order of strata could be found in areas that were far apart, and these strata contained similar _______.
Isotopic dating relies on a process called _______, where heavier radioisotopes transform into lighter elements.
The Permian Period lasted from 299 Ma to 251 Ma. This means that the Permian Period lasted _______ years.
A rock inclusion in a basalt lava flow is dated at 56 Ma. This means the lava flow must have occurred _______ 56 Ma.
Respond to the following based on your reading.
You are trying to assign a date to a layer of tephra. While examining the tephra, you notice that it contains several shale inclusions. If you determine that the dates of the shale inclusions range from 910 ka to 1.3 Ma. What can you say about the age of the tephra layer?
Explanation:answer:
1.Uniformitarianism
2.fossils
3.radioactive decay
4.48 million
5.after
6.The youngest age of the shale is 910 ka. According to the principle of inclusions, the shale formed before the tephra, so the tephra must be younger than 910 ka.
A playa is a(n) blank
Answer:
natural lake that is dry for long periods of time :)
Answer:
Natural lake that is dry for long periods of time.
Explanation:
A playa is a(n) natural lake that is dry for long periods of time.
How are the populations of Australia and New Zealand similar?
Question 13 options:
They are both rural.
They are both mostly indigenous peoples.
They are both shrinking.
They are both aging.
Explanation:
they are both aging.austrila and newzealand medium age is 37.5 year
Australia and New Zealand's populations are similar as they are both aging, referring to the increase in the median age of their populations. They have a mix of rural and urban areas, and significant indigenous populations, but are not majority indigenous, and their populations are growing, not shrinking.
Explanation:The populations of Australia and New Zealand are similar in that they are both aging. This refers to the fact that the median age for both countries is increasing, indicating that the proportion of older individuals in these societies is growing. This is due to a combination of factors, including lower fertility rates and increases in life expectancy. While both countries have rural areas, they also have large urban populations; and while indigenous peoples form a significant part of both populations, they are not the majority in either country. The populations of both countries are also not shrinking, but growing, albeit at different rates.
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The U.S. government has three branches: executive, judicial, and legislative.
Each branch plays a different role in making sure laws are passed, enforced,
and applied fairly in accordance with the United States Constitution. Which
idea does this scenario best represent?
This idea is seperation of powers. This idea makes sure that every branch of the government has equal powers and each branch sort of overlooks a different branch in order to keep one branch from getting too much power and our government from becoming a dictatorship.
Separation of powers is the concept here. In order to prevent one branch from gaining excessive power and our country from turning into a dictatorship, this theory ensures that each part of the government has equal authority and sort of looks over a different branch.
In an organizational system known as the separation of powers, duties, responsibilities, and authority are distributed across many groups rather than being held centrally.
Political systems in which the legislative, executive, and judicial functions of government are each vested in different bodies are most strongly identified with the concept of separation of powers.
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What’s responsible for preventing the gas giants from collapsing into a star
Answer:
helium inside the core that pushes outward kepping the star from collapsing
Explanation:this is my favorite subject
Answer:
C. Their fast rotation rates result in centrifugal force
Explanation:
A gas giant is a star that is composed of the hydrogen and helium and is also known as the failed stars and makes 3 to 13 percent of the mass, as they consist of a layer of molecular hydrogen. The presence of the hydrostatic equilibrium that creates a pressure in the core due to the life cycle. Also here fast rotational speeds and the results from centrifugal forces that operate on them are known to have presented the form collapsingwhat is an important part of the cycle that has made and kept the earth a place where living things can survive
A. erosion
B. mechanical weathering
C. chemical weathering
D. glaciers
Answer:
What is an important part of the cycle that has made and kept the earth a place where living things can survive erosion - A.
Answer:Erosion is your answer
Explanation:
For hundreds of years before India’s independence from Great Britain, Hindus and Muslims had been _____.
independent
separate
peaceful
hostile
Answer:
hostile ...they had dislike each other because of their different religions
Which of these phrases best explains how geographers use the word place?
A.
to show how natural processes are changing the Earth
B.
to describe the characteristics of a location
C.
to explain how areas are grouped together into regions
D.
to discuss the location of a certain area
Answer:
D.to discuss the location of a certain area
Answer:
Option (B)
Explanation:
A place is usually referred to as a particular location, which has certain characteristics. A geographer commonly describes the various characteristics of a location. This place is described based on physical characteristics as well as human characteristics. The physical characteristic includes the climate, topography and landforms, latitude and longitude, altitudes. On the other hand, human characteristics include human settlement areas and other human actions.
Thus, a geographer defines a place by explaining the various characteristics of a location.
Thus, the correct answer is option (B).
Tyson gets an average of 20 2-point shots in one hour. at this rate how many points will he score in an hour and a half
Answer:
30 2-point shots
Explanation:
20 in 1 hour
1 1/2 hours = 30 because half of 20 is 10 so 20 + 10 = 30
Who was most responsible for making French the national language of France?
A: French kings
B: Frank conquerors
C: French writers and philosophers
D: the French Academy
French kings are the correct answer because the French kings are the most responsible for making French the natural language of France. The answer choices are A.
Answer:
A: French kings
Explanation:
French kings were most responsible for making French the national language of France.
what is the formula for radius
Answer:
divide the diameter by 2
Explanation:
but if you mean to find the circumference the formula is pi times radius
Which of the following is a negative features of a free-market system?
A. Everyone has the chance to work hard and aquire wealth.
B. It's unequal some people do well while others do not
C. The individual can own property and dictate business
D. Producers and consumers set the prices the market will bear
Answer:
B. It's unequal, some people do well while others do not
Explanation:
From the suggestions, the only negative feature of the free-market system is that some people do very well, while others don't. Now this can be considered as inequality from one side, but on the other it can be looked as people getting as much as they deserve, or rather in accordance to their capabilities. The nature of people is to compete and progress, and it is very understandable when the smartest people manage to earn much more than the others, as well as the people that have lower mental capabilities earning less as that is their potential. Lot of people see this is inequality of the distribution of money, but it will also not be fair if everyone, no matter their capabilities, and what they do, earn the same.
Answer:
It’s unequal; some people do well while others do not.
Explanation:
Convert 4x/3 to degrees.
A. 60°
B. 120°
C. 240°
D. 480°
[tex]\displaystyle\\\text{You wanted to write }~~4\pi/3~~\text{instead of}~~4x /3.}\\\\4\pi/3=\frac{4\pi}{3}=\frac{4\times180^o}{3}=4\times60^o=\boxed{\bf240^o}\\\\\text{\bf~Correct answer: }~~\bf~C)~~240^o[/tex]
Answer:
C. 240°
Explanation:
4 x 180
------------ = 4 x 60 = 240
3
Differentiate an orthophoto from map
Explain how natural actions such as weathering, erosion (wind, water and gravity), and soil
formation affect Earth's surface.
Answer:
they can not only create formations such as the Grand Canyon, but we can also see loss of nutrients in soil due to wind erosion carrying it away. Additionally, mountain tops wear down, hills begin to flatten, and etc.
The effects of soil erosion and soil formation go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species. And degraded lands are also often less able to hold onto water, which can worsen flooding.
What is soil erosion?Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. Erosion whittled these gorgeous spires of Vermillion Cliffs National Monument, Arizona.
What is weathering?Weathering is the breaking down or dissolving of rocks and minerals on Earth's surface. Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.
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What role did social media play in politics in Iran in 2009?
The social media in Iran, in 2009, as well as after that, has mostly been used for propaganda. The freedom of the social media, thus the freedom of speech too, are very limited, almost non-existent in Iran. The government holds strongly the social media and it decides what can go through and what not, with the majority of the content being focused around the government and positives about it, showing the opposition in bad light, and even more, showing the enemies of the country is evil and that they constantly plot something against them.