Geologic Time

Question 1

Which unit of geologic time began 65.5 million years ago and continues to the present?

Revolt · Accepted Answer

Cenozoic era

Question 2

Which unit of geologic time is the oldest?

Revolt · Accepted Answer

Precambrian

Question 3

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 4

Study the image.8307-06-05-10.jpg

Revolt · Accepted Answer

The first flowering plants were introduced toward the end of the Mesozoic era.

Question 5

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 6

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 7

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 8

What is the purpose of a geological time scale ?

Revolt · Accepted Answer

It is used to present the correct sequence of events in the Earth’s history.

Question 9

Which best explains how gravity contributes to the formation of layers in protoplanets?

Revolt · Accepted Answer

Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.

Geologic Time Answers

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