Geologic Time

Question 1

What does the geologic time scale confirm about the Cretaceous period?

Revolt · Accepted Answer

It ended during the Mesozoic era.

Question 2

What caused Earth's oceans to begin forming during Precambrian Time?

Revolt · Accepted Answer

Water vapor condensed as Earth's surface cooled

Question 3

The table shows index fossils.

Revolt · Accepted Answer

Life forms existed during the Cambrian period.

Question 4

Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?

Revolt · Accepted Answer

The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.

Question 5

Why is radioactive dating important when approximating the age of Earth?

Revolt · Accepted Answer

Scientists can determine the order of when rocks formed on Earth.

Question 6

Which process contributes to the formation of layers in protoplanets when unstable elements release particles and energy?

Revolt · Accepted Answer

radioactive decay

Question 7

How did the formation of the ozone layer contribute to the existence of life on Earth?

Revolt · Accepted Answer

It blocked the Sun’s harmful UV rays.

Question 8

Study the geologic time scale.The Eocene period exists in Earth’s history around 34 MYA. What could a scientist do to determine what era the Eocene period belongs to on the geologic time scale?

Revolt · Accepted Answer

study information related to the Cenozoic era

Question 9

Study the image about geologic time.

Revolt · Accepted Answer

Quaternary

Question 10

Which evidence is most likely used to indicate the beginning of solar system formation?

Revolt · Accepted Answer

Materials were pulled together by gravity.

Geologic Time Answers

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