Geologic Time

Question 1

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 2

The table shows index fossils.

Revolt · Accepted Answer

Life forms existed during the Cambrian period.

Question 3

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

Revolt · Accepted Answer

Water vapor condensed as Earth's surface cooled

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

What was the significance of collisions of dust, rock, and ice during Earth’s formation?

Revolt · Accepted Answer

to modify the density of materials present on Earth

Question 6

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 7

Which led to the formation of oceans after water on Earth’s surface evaporated?

Revolt · Accepted Answer

As Earth cooled, water in the atmosphere condensed.

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

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

Revolt · Accepted Answer

Materials were pulled together by gravity.

Question 10

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

Revolt · Accepted Answer

It ended during the Mesozoic era.

Geologic Time Answers

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