Geologic Time

Question 1

The table shows index fossils.

Revolt · Accepted Answer

Life forms existed during the Cambrian period.

Question 2

What information does the geologic time scale provide about Earth's history?

Revolt · Accepted Answer

The sequence and timing of major events in Earth's history

Question 3

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

Revolt · Accepted Answer

radioactive decay

Question 4

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

Revolt · Accepted Answer

Materials were pulled together by gravity.

Question 5

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

Revolt · Accepted Answer

Water vapor condensed as Earth's surface cooled

Question 6

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 7

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 8

Which period is older than the Triassic period?

Revolt · Accepted Answer

Cambrian

Geologic Time Answers