Pretest

Question 1

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 2

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

Revolt · Accepted Answer

It ended during the Mesozoic era.

Question 3

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

Revolt · Accepted Answer

Cenozoic era

Question 4

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 5

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

Revolt · Accepted Answer

to harden materials to form different parts of Earth’s layers

Question 6

Which period is older than the Triassic period?

Revolt · Accepted Answer

Cambrian

Question 7

What information does the geologic time scale provide?

Revolt · Accepted Answer

information about when plants first appeared

Question 8

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

Revolt · Accepted Answer

Materials were pulled together by gravity.

Question 9

Which unit of geologic time is the oldest?

Revolt · Accepted Answer

Precambrian

Question 10

How long ago did oceans begin to form?

Revolt · Accepted Answer

3800 MYA

Pretest Answers