when did the cambrian explosion occur

Answers

Answer 1
The Cambrian explosion, also known as the Cambrian radiation, occurred nearly 541 years ago during the Cambrian period. This event was an unexpected and quick presence of complex animals in fossil record. 

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Related Questions

why is russia officially call the russian federation

Answers

The number of territories it consists of. 

Answer:

Russia is officially called the Russian Federation (RF) because it is constituted of about 85 federal constituent units.

Explanation:

A federation is basically a larger government made up of many other smaller governing units of principalities. The country of Russia is divided into '85 such federal units' which are administered by their own local governing bodies. These local governing bodies are accountable to the central government of Russia. The central government performs supervision over the smaller federal units and is the supreme parent authority.

What is the very large depression at the top of some volcanoes called?

Answers

Caldera is a very large it depression at the top of some volcanoes do.
Hope it helped you.
-Charlie

Answer:

Caldera

Explanation:

A caldera is defined as a prominent geological feature that is a very large type of depression, which forms right after the eruption of a volcano. The caldera has a diameter of about 1 km and the all the pyroclastic materials, volcanic ashes, blocks and lapillies and harmful gases are ejected through this caldera. As the rocks of the apical portion melts and collapses, the caldera gets is circular shape.

The majority of India’s population is

Answers

hindu takes up over 80 percent of the population

Answer:

The majority of India’s population is Hindu by religion.

Explanation:

The Hindus in India make up about 80% of the entire Indian population. The country is predominantly a Hindu majority country owing to its vast history of Hindu descendant. Though there is a huge majority of Hindus in the country, the government claims to have no official state religion. According to the census data of the last few decades, the percentage of Hindu population in India is observed to have been declining.

What forms when a river enters a large body of water?

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What may form in a large body of water such as a lake or ocean, is a delta

Is comprised of the crust and the upper most mantle?

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The Earth's Crust, Lithosphere and Asthenosphere. ... Also, ocean crust is made of denser minerals than continental crust. The tectonic plates are made up of Earth's crust and the upper part of the mantle layer underneath. Together the crust and upper mantle are called the lithosphere and they extend about 80 km deep.

The axis is the imaginary line that runs through the center of the earth between the North and South Poles. True Or False?

Answers

True, the Earth's axis runs from the north pole to the south pole.

Answer:

The statement that states that the axis is the imaginary line which runs through the 'center of the earth' between the South and North Poles is true.

Explanation:

The Earth rotates on its geographic axis which is inclined at an angle of 23.5° with respect to the horizontal plane of the Earth's rotation. This axis passes through the geographic poles of and makes a straight line connecting the two poles located on two different hemispheres of the planet.

A material that contains hard-to-mine petroleum is

Answers

metamorphic rock <the answer

Baghdad is the capital of what middle eastern country

Answers

Baghdad is the capital of iraq

Baghdad is the capital of Iraq, a Middle Eastern country located in the historical region of Mesopotamia. It was established by the Abbasid Caliphate and has since been an important cultural and trade center.

Baghdad is the capital of Iraq, a country in the Middle East. Iraq is located between the Tigris and Euphrates Rivers, an area historically known as Mesopotamia, where early human civilizations thrived. Baghdad was founded by the Abbasid Caliphate in the eighth century and has since been a significant center of trade, culture, and history.

Baghdad, the capital of Iraq, is a city rich in history and culture. Situated on the Tigris River, it has been a significant center of the Islamic world since its founding in the 8th century.

What factor has prevented ,Myanmar's economic development?

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Myanmar also known as Burma is an emerging economy with a nominal GDP of $74,000 billion in 2018. Factors that prevent Myanmar's economic development are, Industries like, Garment production, Illegal drug trade, Oil and gas, Gemstones, Tourism, and external trade. It is also followed by the macro-economic trends as Foreign investments and foreign aid. Their major agricultural production is rice which covers about 60% of the country's total cultivated  land area. Burma is the largest producer of methamphetamine in the world. And it is the 2nd largest supplier of opium.

The subfield of geography and geology concerned with the study of the origins, evolutions, form, and spatial distribution of the earth's landforms is

Answers

The answer is - Geomorphology.
Geomorpholgy is the scientific study of the origin and evolution of topographic and bathymetric features created by physical, chemical or biological procesess operating at the surface or near the surface of the Earth. Geomorphologists seek to understand why are the landscapes the why they are, to understand the dynamics and history of the landforms, as well aspredict the changes through a combination of field observations,numerical modeling and physical experiments.

The hawaiian islands are composed of what type of volcanoes?

Answers

The types of volcanoes on Hawaii is called a shield volcano that gently slopes to an opening.

What happens to the surfaces of bodies without an atmosphere and no erosion?

Answers

If there's no atmosphere and no erosion than the surface of the bodies remains the same, unchanged. The atmosphere causes the erosion, be it mechanical, chemical or organic (indirectly), and all of the erosion types cause the surfaces of the bodies to change their forms over time because they break them apart, either in small or big pieces. So once the atmosphere is non existent, the erosion is automatically non existent as well, thus the surface of the bodies remains as it is. 

Secondary seismic waves (s waves) ______. are the slowest seismic waves travel through solids, liquids, and gases

Answers

the answer to this question for this question is what we call a sS wave

Secondary seismic waves or s waves are the slowest seismic waves that travel through solids, liquids and gasses.

What are seismic waves?

A seismic wave is a wave of acoustic energy that travels through the Earth. It can result from an earthquake, volcanic eruption, magma movement, a large landslide, and a large man-made explosion that produces low-frequency acoustic energy.

Seismic waves are studied by seismologists, who record the waves using seismometers, hydrophones or accelerometers. Seismic waves are distinguished from seismic noise which is persistent low-amplitude vibration arising from a variety of natural and anthropogenic sources.

The propagation velocity of a seismic wave depends on the density and elasticity of the medium as well as the type of wave. Velocity tends to increase with depth through Earth's crust and mantle but drops sharply going from the mantle to Earth's outer core.

Earthquakes create distinct types of waves with different velocities. When recorded by a seismic observatory, their different travel times help scientists locate the quake's hypocenter. In geophysics, the refraction or reflection of seismic waves is used for research into Earth's internal structure.

Scientists sometimes generate and measure vibrations to investigate shallow, subsurface structures.

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Where the land is flat, ________ exerts a minimal influence on topographic development. where the land is flat, ________ exerts a minimal influence on topographic development. gravity water mechanical weathering chemical weathering biological weathering?

Answers

The correct answer is - gravity.
The gravity with it's pulling force puts pressure on the objects by pulling them downwards, which with the help of few other factors makes the objects break and fall, and thus change the relief forms. But this is only when there's something in a position that means that it can fall downwards, but this is lacking on a flat land because there's nowhere where the object can be pulled and fall down.

Which area often experiences long periods of drought?


the southeast region


the Brazilian Highlands


the Amazon River basin


the sertão

Answers

Answer:Sertao is the answer

Explanation:

Answer:

Explanation:

The sertao

Describe the disaster at Chernobyl.

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On April 26, 1986, the world's worst nuclear accident happened at the  Chernobyl plant near Pripyat, Ukraine, in the Soviet Union. An explosion and fire in the No. 4 reactor sent radioactivity into the atmosphere. Plant operators made several mistakes, creating a poisonous and unstable environment in the reactor core. A peculiarity of the design of the control rods caused a dramatic power surge as they were inserted into the reactor.

Answer:

the Chernobyl disaster; during a run-down to a lower power, a combination of operator error and xenon poisoning caused the reactor thermal power to fall to near-shutdown levels. The crew's resulting efforts to restore power placed the reactor in a highly unsafe configuration.

Explanation:

A system of measurement that uses multiples and sub-multiples of ten is known as a ___________ system of measurement.

Answers

The SI unit measures in sub mutiplies of ten 

For mountain ranges that are subjected to prevailing winds, why is the climate drier on the leeward (downwind) side?

Answers

For the mountain ranges that are subjected to prevailing winds, the climate is dryer on the leeward side because the clouds with the rains either do not pass, or pass but are mostly dried out. This is because the other side of the mountain range stops the clouds and the rain falls predominantly on that side, so the clouds either do not pass at all on the leeward side, or if some of them manage to pass, they have very little moisture left so the rain is obscure, thus the leeward sides are usually dry.

Weather-station measurements indicate that the dewpoint temperature and air temperature are getting farther apart and that air pressure is rising.which type of weather is most likely arriving at the station?

Answers

The weather most probably arriving at the station is a cool, dry air. This kind of weather matches the characteristics shown in the weather instruments. The dewpoint temperature and air temperature are getting farther apart means that the air is getting dry while the rising air pressure represents a decreasing temperature.

The weather station measurements indicating that the dewpoint temperature and air temperature are getting farther apart, combined with the rising air pressure, suggest that clear and more settled weather is likely arriving at the station.

The dewpoint temperature is the temperature at which air becomes saturated with moisture and dew can form. When the dewpoint and air temperatures are close together, it implies higher relative humidity, often associated with cloudier skies and potential precipitation. Conversely, when the dewpoint and air temperatures are farther apart, it usually signifies lower humidity and clearer skies. Rising air pressure typically indicates the approach of a high-pressure system, which is commonly linked to fair weather conditions. This transition can lead to sunny skies and less precipitation. Weather forecasting involves complex variables, but these signs—increasing gap between dewpoint and air temperatures alongside rising pressure—are classical indicators of improving weather conditions.

The streams and smaller rivers that feed into a main river are called

Answers

The streams and small rivers that feed into the main rivers are called tributaries! An example of a tributary is the Illinois river, which is a tributary of the Mississippi River

Identify what igneous rock is primarily dependent on for its chemical composition

Answers

Igneous rocks are defined as formations made from solidified lava or magma.

When lava or hot Magma reaches the surface of the earth or a water body it quickly cools down and changes it's from from a hot liquid to a solid rock.

The chemical composition of Igenous rocks can vary depending on their location, cooling time etc.

However, most Igenous rocks contain some or all of the following minerals:

1. Quartz

2. Micas

3. Amphiboles

4. Olivines

5. Pyroxenes

6. Feldspathoids

7. Feldspars



How far do you have to go for the North Star not to be north anymore?

Answers

Under It????????????????

In what way are volcanic eruptions and meteoric impacts similar?
A.Both can cause global cooling.
B.Both can cause global warming.
C.Both emit oxygen gas into the atmosphere.
D.Both have a greater effect on weather than on climate.

Answers

I would say that A and D are the correct answers that a major volcanic eruption like Krakatoa in the 1800's can fill the atmosphere with ash and block out the sun and cool off the weather for up to a year or so as can particles from a meteorite impact and also they can affect the weather ie a short term effect rather than the climate.

Answer:

A.Both can cause global cooling.

Explanation:

     According to researchers, the impact of an asteroid and volcanic eruptions probably covered the planet with harmful dust and gases, which could change the climate and caused the early extinction of many species.

    Life on earth would take thousands of years to recover from the devastation.

    "The scenario we suggested, that the impact of the asteroid would cause volcanism, reconciles with the facts we once thought was an unbelievable coincidence," said Mark Richards of the University of California at Berkeley.

_______ are the first waves to leave the focus after an earthquake.

Answers

I think that the answer for this question is P- waves

The gas that is the largest component of the atmosphere is _____.
a. water vapor
b. oxygen
c. carbon dioxide
d. nitrogen
e. argon

Answers

Is either C or B that’s the only two it can be.

The gas that is the largest component of the atmosphere is oxygen. The correct option is B. In nature, nitrogen (N2), which accounts for about 78% of air, is the most prevalent gas. The second most prevalent gas after nitrogen (N2) is oxygen (O2).

Which gases are most important?

One of the most crucial gases to humans is oxygen. Due to the necessity of carbon dioxide for photosynthesis in plants, it is one of the most vital gases for all life on Earth.

The other main factor is that, in contrast to oxygen, nitrogen is much more stable in the atmosphere and plays a much smaller role in chemical reactions that take place there. As a result, it has accumulated in the atmosphere to a much greater extent than oxygen over geological time.

Thus, the ideal selection is option B.

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Which earthquake severity scale varies from locality to locality for a single earthquake?

Answers

The answer is - Mercalli intensity scale.
The Mercalli intensity scale represents a seismic intensity scale which is used for the measuring of the intensity if an earthquake. It is a scale that measures the effects of an earthquake. This scale is not based on first physical principles, but is, instead, empirically based on observed effects.

The length of time that a volcanic eruption impacts the climate is largely determined by

Answers

The length of time that a volcanic eruption impacts the climate is determined by the capacity of the volcano and how much material it will let out in the atmosphere. The smaller the volcano, with smaller capacity, the smaller effect it'll have on the climate and the duration of it's impact, and the space on which it'll have climatic impact. The bigger the volcano, with bigger capacity, the bigger the effect on the climate and the duration of it, and the bigger the space it will have climatic impact on.

Answer:

The length of time that a volcanic eruption impacts the climate is largely determined by  whether the ash or gas reaches the stratosphere

Explanation:

A volcanic eruption releases gases and other particles in the atmosphere. The factor whether these released material reaches the stratosphere or not, determines whether that particular volcanic eruption will affect the climate or not.

The enormous output from the eruption gets released in the atmosphere. This output forms a permanent layer in the atmosphere over time and becomes a barrier to the sunlight reaching the earth.

The decrease in sunlight causes cooling effect thereby decreasing the temperature of the planet.

The time taken by the emission to reach the stratosphere determines the time taken by the emission to change the climate of the planet.

On a geologic map, strike represents the directional orientation of a fault.

Answers

This is TRUE

Strike is a way of representing the 3D orientation of a planar surface on a 2D map. Fault can be characterized by brittle deformation in rocks. These faults can be oriented at any direction (Strike). Shear stresses can produce faults where movement can occur in strike direction.



Answer:

The statement that says 'on a geologic map, strike represents the directional orientation of a fault' is false.

Explanation:

If it is considered that the given geologic map is of a horizontal plane, then the 'direction of the rock' present on this horizontal plane would be represented by a strike on the given geologic map. To represent a fault on the 'geologic map', the symbol of a thick line inclined towards the right is used.

what kind of fossil aging is used when scientists use the law of superposition?

Answers

When scientists use the law of superposition to determine the age of a fossil, they go by the principle of 'every undisturbed layer of rock is older than the layer above it. This is not the most precise way of determining age, and in fact this method can only reveal the approximate age, but not the exact one.

Answer:

When scientists use the law of superposition, the type of fossil aging they use is known as relative aging.

Explanation:

Scientists use different methods of aging to determine the 'age of rock fossils'. One of these techniques is that of relative aging. In this technique, the scientists 'determine the age of the bottom-most rock fossil' first and go by the principle that every new layer of rock superpositioned above the lower rock is comparatively younger than the lower rock.

What are the large and small magellanic clouds, and the sagittarius and canis major dwarfs?

Answers

The Small Megallanic Cloud represents the smaller irregular galaxy, while the Big Megallanic Cloud represents the big irregular galaxy. Together they make up the Megallanic Clouds.
Sagittarius Major Dwarf is an elliptical galaxy.
Canis Major Dwarf is an irregular galaxy, with a mass of about a billion solar masses.
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