Answer:
b. Bacteria photosynthesizing dissolved carbon dioxide in oceans
Explanation:
The levels of oxygen that we know nowadays in the atmosphere have not been like this in the more distant past. In order for the oxygen to start building up and change the composition of the atmosphere, something needed to happen, and that something was the cyanobaceteria. The cyanobacteria was able to perform photosynthesis, so it started to use the dissolved carbon for it, while in meantime it was releasing oxygen in the atmosphere. As the cynaobacteria was growing in numbers, over the course of millions of years, it managed to propel enough oxygen in the atmosphere so that the other organism can start developing, thus changing the world forever.
The earliest event enabling oxygen production in Earth's atmosphere was cyanobacteria, also known as blue-green algae, photosynthesizing dissolved carbon dioxide in oceans and releasing oxygen as a byproduct.
Explanation:The earliest event that allowed for the production of oxygen in Earth's atmosphere was b. Bacteria photosynthesizing dissolved carbon dioxide in oceans.
During the first two billion years of Earth's existence, the atmosphere was anoxic - it lacked molecular oxygen. The only living organisms were anaerobic organisms, which can survive without oxygen. The process began to change with the appearance of phototrophs, autotrophic organisms which convert solar energy into chemical energy, and later cyanobacteria or blue-green algae evolved from these simple phototrophs.
Cyanobacteria began the oxygenation of the atmosphere by undertaking photosynthesis and releasing oxygen as a by-product. Their emergence and the resulting increase in atmospheric oxygen allowed for the development of more complex life forms, and the colonization of land, as the ozone layer (formed from oxygen) could absorb harmful ultraviolet light.
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The area of a right triangle is 25 square meters. The height is twice as long as the base
The area of ANY triangle is
Area = (1/2) (base x height) .
If the height is twice as long as the base, then
25 m² = (1/2) (base) x (2 x base)
25 m² = base²
base = 5 m
height = 10 m
The base of the triangle is 5 meters and the height is 10 meters.
Explanation:To find the base and height of the right triangle, we can use the formula for the area of a triangle: A = 1/2 * base * height. Let's assume the base is x. According to the given information, the height is twice as long as the base, so the height is 2x. Plugging these values into the formula, we get 25 = 1/2 * x * 2x. Simplifying the equation, we have 25 = x^2.
Taking the square root of both sides, we get x = 5. So the base of the triangle is 5 meters. Since the height is twice as long, the height is 10 meters.
Therefore, the base of the right triangle is 5 meters and the height is 10 meters.
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The first people to settle in Ireland were _____.
The first people to settle in Ireland were mesolithic
This places humans in Ireland in the Paleolithic era; previously, the earliest evidence of people came from the Mesolithic, after 10,000 years ago.
When did Mesolithic people come to Ireland?Ireland was colonised by human beings approximately 10,000 years ago during a period of the Stone Age referred to as the Mesolithic.
These people did not build large monuments or live in large settled communities and therefore it is difficult to draw conclusions about their lives and nature.
Who were the Mesolithic people?The people of Mesolithic Ireland were hunters and gatherers - farming was not invented until the Neolithic period. The family groups would have lived near rivers and lakes in houses made from animal skins spread over a bowl-shaped timber frame.
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Which statement best describes the theory of plate tectonics?
•plates sometimes move closer to one another
•sections of earth that shift are parts of earths asthenosphere
•sections of earths continents are in slow constant movement
•parts of the ocean floor move as they are carried by rift valleys
Answer:
The statement that best describes the theory of plate tectonics is the one that says that sections of Earth's continents are in slow constant movement.
Explanation:
Plate tectonics is a geological theory developed to explain the phenomenon of continental drift, that is, the continents of the earth are not invariably positioned on the surface of the earth but move in proportion to each other and constantly forming new combinations.
According to plate tectonic theory, the outermost part of the earth's interior consists of two layers, the outer lithosphere and the inner asthenosphere. Plate tectonics arose from two distinct geological observations: scattering zones and continental drift.
The theory of plate tectonics describes sections of earth's continents are in slow constant movement.
What is plate tectonics?Plate tectonics is the is present under the solid crust of the Earth that is known as lithosphere. These plates have the tendency to move in proportion constantly in order to form further new combinations.
Therefore, the theory is discussed as a scientific theory that demonstrates the formation of landforms due to the movements of Earth's subterranean.
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Major deposits of gold and silver are located in which of the following states
Answer:
Arizona and New Mexico
Explanation:
Answer:
Nevada is the state in the United States of America that hosts major mines of both Gold and Silver.
Explanation:
Out of the entire gold produced in the United States, 81% is produced in the state of Nevada alone. The gold produced in Nevada accounts for 5.5% of the total production of gold in the world. Nevada also has a few major mines of silver. The Mount Davidson region of Nevada hosts rich silver deposits.What's responsible for causing eutrophication in waterways?
Answer:
The use of fertilizers
Explanation:
Eutrophication simply implies the increase in nutrient or nutrient enrichment.
Commonly, waterways are connected to other water bodies. When water from farmlands washes fertilizers into them, there is an increase the available nutrient. Overtime, the water can be oversaturated with nutrients and this would lead to eutrophication. We can attribute eutrophication to human activities.
Answer:
fertilizers in water roof
Explanation:
The buffalo and big cypress bayou both contain__
Answer:
Explanation:
they both have great breeding grounds for small fish and shell fish
The Buffalo and big cypress bayou both contains salt marshes.
Explanation:
The salt marshes are 'coastal wetlands' that are flooded and dehydrated by the salt water brought by the tides. This coastal ecosystem act as a great breeding ground for hundreds of species of small and shell fish by occupying intertidal areas.
Cypress Bayou is the name that suits for many wetlands on the western edge of Caddo Lake. The Buffalo metropolitan area is located in Western New York.
They are soggy because the soil can consist of deep mud and peat that are comes from decomposition of bogs and fens. It is located in the southern parts of the US, especially in South Carolina.
which sport, which spread to the region from europe, is the most popluar in north africa
Answer fut-ball(soccer)
Explanation:
Answer:
Football (soccer)
Explanation:
Football (soccer) spread to the region from Europe and is the most popular in North Africa.
1. a short stack of paper represented a region of Earth's surtace, which fold or cut
in the stack would show a monocline?
Answer:
A step-like fold across the stack -D
A monocline is a geological fold where one side of the fold erodes, leaving lifted layers on one side. This could be represented by a single fold in a stack of paper. Large-scale examples of folds are created by continental masses colliding, such as in the formation of the Alps.
Explanation:A monocline is a geological formation that results from an event where layers of rock have been folded due to immense pressure, but then one side of the fold erodes or wears away, leaving the uplifted layers on one side of the formation. If a stack of paper represents the Earth's surface, a monocline would be shown by a single fold in the stack, with the rest of the papers lying flat.
As an example, think about two continental masses moving towards each other. When these masses are colliding, they create immense pressure leading the Earth to buckle and fold. This folding forms various geological structures including monoclines. A good real-world example of this process is the formation of the Alps as a result of the African plate colliding with the Eurasian plate.
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A rectangle has a width of 3 inches. The rectangle's length is 5 times its width. What is the area of the rectangle?
Answer: 45 inches
Explanation: We are given the width, 3 inches. We are also given the information that the length is 5 times the width.
3 times 5= 15. The length is 15 inches. If we multiply 3 and 15, we get 45. The area of the rectangle is 45 inches.
Answer:
Hi there!
15
Explanation:
Well you dont multiply all the sides you just mulitiply the LENGTH times the WIDTH
5 x 3 = 15
There you go!
Now that was easy wasn't it?
Well you have a great day now.
I hope this helped you out.
IAMTHEGOAT
There is a lot of volcanic activity in Southeast Asia because much of the area lies on __________.
A.
Fire Island
B.
Pinatubo Island
C.
the Ring of Fire
D.
the Vulcan Plateau
Answer:
C. Ring of Fire
Answer:
C RING OF FIRE
Explanation:
Southeast Asia lies right underneath China on both islands and peninsulas. It has a series of mountain ranges that have created natural borders. At the same time, the region depends on the sea for contact, food, and transportation. It lies in the Pacific’s Ring of Fire and the region frequently has earthquakes and volcanic activity
Martin had 7 pounds of grapes left, and he gave away
of them Explain how to use compatible numbers to
estimate the amount of grapes he gave away.
Answer:
[tex]\frac{7}{2}[/tex] OR 3.5
Explanation:
Martin gave away 2/5 but we're gonna use 1/2 since it's easier to find the answer with that.
1/2 of 7 is 3.5.
So, Martin gave away about 3.5 pounds.
Hope this helps! Have an amazing day :)
Answer:
2/5 is close to 1/2, and it is easy to find 1/2 of 7 mentally. Half of 7 is 3.5, so Martin gave away about 3.5 pounds.
Explanation:
Which of the following are units of air pressure? Select all that apply.
1.isobar
2.millibar
3.kilopascal
4.barometer
5.atmosphere
6.millimeter of mercury
Answer:
Options 2, 3, 5 and 6 are units of pressure.
Explanation:
You can use all to measure air pressure
Answer:
Options (2), (3) and (6)
Explanation:
Air pressure is usually defined as the weight that the atmosphere exerts downward on the earth's surface. This air pressure varies with the changes that occur in terms of height or altitude. The value of air pressure increases towards the mean sea level and decreases as the height increases.
This atmospheric pressure is commonly measured by an instrument which is known as a barometer. It helps in the weather forecasting.
The S.I unit of atmospheric pressure is Pascal (Pa). In the C.G.S system, the units used are millimeter (mm) of mercury and millibar (mb).
Thus, the correct answers are options (2), (3) and (6).
What factors influence the rate of population growth of Eastern Europe
Answer:
Birth and death
Explanation:
What is another name for Northern Europe
Answer:
nothern germeny
Explanation:
Northern Europe is also known as Norden.
Explanation:
North part of Europe is started to called as Norden before 19^{th} century. According to United Nations, it is a geographical region that consists 8 Nordic countries. They are “Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, Norway, and Sweden”.
The landscapes of the countries are surrounded by the North Sea, the Atlantic Ocean, the Arctic Ocean and the Baltic Sea. This area in Europe approximately has north of Southern coast of Baltic Sea,54°N. Northern Europe's population is relatively small when compared to other regions of the European continent.
The average distance from Earth to the Moon is 384,400 kilometers. What is this distance in miles, rounded to the nearest 100 miles?
Answer:
Explanation:
1.6 km = 1 miles.
384,400 km = x miles
Cross multiply
1.6 * x = 384,400
Divide by 1.6
1.6*x/1.6 = 384400 / 1.6
x = 240,250
Round to the nearest 100
x = 240,300 rounded to the nearest 100
Answer:
Distance in miles to the nearest hundred miles = 238900 miles
Explanation:
The average distance of the earth to the moon is 384, 400 km. To get the distance in miles we need to convert kilometer to miles .
1 km = 0.621371 miles
1 km = 0.621371 miles
384, 400 km = ?
cross multiply to get the miles value of 384,400 km
Distance in miles = 384,400 × 0.621371
Distance in miles = 238855.0124 miles
The nearest hundred miles is gotten when you locate the hundred value . The value start from the second 8 value upward . The closest hundred mile of 855 is 900 since 855 is more closer to 900 than 800.
Rounding to the nearest hundred miles = 238900 miles
true or false - topsoil is generally considered a renewable resource because of the length of time it takes to replenish soil that is lost
Answer:
The given statement is False.
Explanation:
Topsoil is the top part of the soil. Topsoil is generally considered a Non renewable resource because of the length of time it takes to replenish soil that is lost. For the same reason, fossil fuels, that are found in the soil are also considered non renewable. Fossil fuels take almost generations to renew the resources in it. So because of this reason, they are also considered non renewable. Topsoil are not considered renewable because it also take generations to renew the resources in it.
France's busiest seaport is located on the _____.
A: Atlantic Ocean
B: Rhine River
C: English Channel
D: Mediterranean coast
Answer:
C: English Channel
Explanation:
France's busiest seaport is located on the English Channel.
The English Channel is the correct answer, because of the English channel is located at the France's busiest seaport. The answer choices are C.
Which of the following accurately describes rill erosion? A. Fast-moving water from heavy rainfall forms deep channels. B. A raindrop hits the ground and displaces the surrounding soil. C. Runoff removes soil and loose sediment in thin layers. D. Runoff from heavy rainfall forms narrow, shallow channels.
Answer:
Runoff from heavy rainfall forms narrow, shallow channels. - D.
Rill erosion refers to the formation of narrow, shallow channels created by runoff from heavy rainfall, specifically when surface runoff concentrates in small channels, leading to soil particle detachment and transport.
Which of the following accurately describes rill erosion? The correct option is D. Runoff from heavy rainfall forms narrow, shallow channels. This type of erosion occurs when overland flow, or surface runoff, begins to concentrate in small channels on the soil surface, causing detachment and transport of soil particles.
These channels, known as rills, are typically less than 5 cm deep and can be erased with normal farming operations. Rill erosion commonly develops from sheet erosion, which is when raindrop splash and surface runoff remove a uniform layer of soil over a large area. As rills deepen and widen, they can eventually evolve into gullies, which are larger and cannot be smoothed out simply by tillage equipment.
Which of the following statements best describes the uses of geography? This is also one of the six essential elements of
geography
A It helps people understand the ways humans have adapted to and modified their environment
B. It helps people interpret the past, understand the present, and prepare for the future
C. It helps people identify the physical processes that shape the Earth's surface
D. It helps people organize the world spatially
The following statements best describe the uses of geography It helps people interpret the past, understand the present, and prepare for the future. The correct option is B.
One of geography's most important applications is perfectly captured by this remark. Geography enables us to analyze past events, comprehend the present, and make future decisions based on a spatial perspective. This application is in line with geography's broader definition, which takes into account how people, places, and the environment are related.
Thus, the ideal selection is option B.
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which plates form a boundary with the African Plate? check all that apply.
-pacific
-Antarctic
-eurasian
-Philippine
-south american
Answer:
south american, Antarctic, eurasian
Explanation:
The African Plate is a major tectonic plate hat divided by the equatorial into two halves and this plate covers an approx area of 61,300,000 km square and is bounded by the Atlantic ocean and the mediterranean sea in the north and is bounded the Antarctica from the south. and has south American plate on the west. The plate also has a rift valley formation on its right side with the red sea and this plate continues to move in the eastern and the upwards direction of movement at a speed to 2.15 cm per year and is an origin of the supercontinent named as the Gondwana landmass. Thus surrounded by the South American, the antarctic and the Eurasian plate form all sides as given in the map.What is the atmosphere? Where is Earth’s atmosphere located, and what does it contain?
Answer:
The atmosphere of the earth Is the layer of gases. The earth atmosphere is made up of Nitrogen and oxygenaccount for 99 percent of the gases in dry air, with argon, carbon dioxide, helium, neon, and other gases making up minute portions. Water vapor and dust are also part of Earth’s
Earthshine is illumination seen during which phase of the moon?
Answer:
Waxing Crescent Moon or Crescent Phases
Explanation:
For starters Earthshine is when a rather dim light is present on the moon, which is a result of the sun reflecting light off of the Earth and onto the moon. I put in Crescent Phases with the answer, as some questions might bundle the crescent phases together.
Answer:
Crescent Phase
Explanation:
Crescent is a blurred phase that occurs in the moon when it is less than half. During this phase, the moon is illuminated in some parts, and it keeps on decreasing from the lit towards the semicircle quarter until it completely disappears to resurface as a new moon.
During this phase the moon is usually thinner at night this is called waning, when it reaches the third quarter the moon shows as one side of the disc blurred while the other hand is dark.
Which characteristics are used to describe air? Check all that apply.
altitude
Odensity
O mass
O pressure
radiation
Answer:
Density and Pressure
Explanation:
Density and Pressure are characteristics used to describe air.
ANSWER:
The characteristics that are used to describe air are:
DensityMass Pressure.EXPLANATION:
The density of air differs from one place to another so density characterizes the characteristics of air on that place. Similarly, pressure and mass also determines the characteristics of air. In normal temperature and pressure the air has the pressure of 1atm and density of [tex]\bold{1.204 \frac{k g}{m^{3}}}[/tex]In this way air is characterized by the density, pressure and mass.How is the history of colonialism in Africa related to the currently failed states
of Africa?
D
A. Colonialism created a manufacturing-based economy.
B. Colonialism created artificially stable countries.
O
C. Colonialism reduced the importance of natural resources.
O
D. Colonialism increased the price of raw materials.
Answer:
colonialism has caused ethnic tensions and also created artificially stable countries as well.
What was the “Velvet Divorce”?
Czechoslovakia’s split into two countries
the rift between Czechoslovakia and Poland
the end of communism in Czechoslovakia
the first phase of the Velvet Revolution
Answer:
Czechoslovakia's split into two countries
Explanation:
The Velvet Divorce is a term used for the split of Czechoslovakia into two separate countries. The separation was peaceful, without violence, so it was all negotiated without any problems, with the two newly formed nations remaining in good relations. The reasons for the split were that the two parts of Czechoslovakia had different political aspirations, had different ethnic groups, and they had different opinions as two how they should develop. It is an interesting case among the Slavic nations though, as in most cases there has always been lot of bloodshed, while in this case it was all peaceful and calm.
Answer:
a - Czechoslovakia’s split into two countries
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how is a glacier formed
A. the melting and refreezing of snow
B. the erosion and deposition of ice
C. the weathering and erosion of snow
D. the melting and precipitation of snow
Answer:
i think its c
Explanation:
A civilization that is vulnerable to attack from warring civilizations might be
Answer:
A civilization that is vulnerable to attack from warring civilizations might be
on a vast, open plain with rich resources.
The correct answer to this open question is the following.
A civilization that is vulnerable to attack from warring civilizations might be on a vast, open plain with rich resources.
That was the case of many civilizations since ancient times that were invaded by others to take their properties, lands, and exploit their raw materials. Civilizations in the valleys of what today is western Europe suffered from these attacks. The opposite happened with nations such as ancient China that remained isolated many years due to its geographical and natural barriers such as the Himalayas mountains, the Everest, the Yellow River of the Gobi Desert.
A country’s wealth has little effect on the health and welfare of that country's population. true or false
Answer:
False
Explanation:
If the country is wealthy the people of it should have better health and welfare because it will be a cleaner place.
Answer:
False
Explanation:
Websites for social networking and blogging are examples of which type of
communication?
O
A. Video conferences
O
B. Social media
O
c. Print magazines
O
D. Word of mouth
Websites for social networking and blogging are examples of social media communication. Thus, option B is correct.
What is communication?Sending, obtaining, and transmitting content through speech, writing, hearing, and reading constitute the process of communication. Communication can be divided into three parts that are verbal, nonverbal, and visual.
Internet-based social media is a kind of communication. Through social media websites, people can take part in discussions, share information, and create material for the internet.
Due to digital communication, which can include blogging, information has now reached people and communities that were previously inaccessible. The general population is today better educated about what is happening throughout the world. Therefore, option B is the correct option.
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In the 1800s,the boundaries between the United States and Mexico changed drastically because of?
Answer:
In the 1800s,the boundaries between the United States and Mexico changed drastically because of a war between the two countries.
Answer:
C. A war between the two countries
Explanation: