Geologic Time

Question 1

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 2

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 3

Study the image about geologic time.

Revolt · Accepted Answer

Quaternary

Question 4

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 5

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 6

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.

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

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

Revolt · Accepted Answer

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

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.

Geologic Time Answers