Spheres of Earth

Question 1

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 2

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 3

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 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

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 6

The table shows index fossils.

Revolt · Accepted Answer

Life forms existed during the Cambrian period.

Question 7

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 8

Study this image of a geologic time scale.

Revolt · Accepted Answer

520 million years ago

Question 9

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

Revolt · Accepted Answer

radioactive decay

Question 10

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.

Spheres of Earth Answers