Geologic Time

Question 1

Which evidence supports the claim that Earth’s continents formed during Precambrian time?

Revolt · Accepted Answer

Earth’s surface cooled, causing rocks to cool and harden.

Question 2

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

Revolt · Accepted Answer

Materials were pulled together by gravity.

Question 3

Which event in Earth’s history most directly allowed life to exist on land?

Revolt · Accepted Answer

Single-celled organisms released oxygen into the air when they photosynthesized.

Question 4

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

Revolt · Accepted Answer

It ended during the Mesozoic era.

Question 5

The table shows index fossils.

Revolt · Accepted Answer

Life forms existed during the Cambrian period.

Question 6

Which unit of geologic time is the oldest?

Revolt · Accepted Answer

Precambrian

Question 7

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 8

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 9

Study the graph about oxygen content of Earth’s atmosphere.Which describes oxygen content as Earth evolved over time?

Revolt · Accepted Answer

Oxygen levels stay above 15 percent starting 200 million years ago

Question 10

Study the image about geologic time.

Revolt · Accepted Answer

Quaternary

Geologic Time Answers

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