Geologic Time

Question 1

Which period is older than the Triassic period?

Revolt · Accepted Answer

Cambrian

Question 2

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 3

The table shows index fossils.

Revolt · Accepted Answer

Life forms existed during the Cambrian period.

Question 4

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

Revolt · Accepted Answer

Cenozoic era

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

Revolt · Accepted Answer

Water vapor condensed as Earth's surface cooled

Question 7

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 8

Study the image about geologic time.

Revolt · Accepted Answer

Quaternary

Question 9

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 10

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.

Geologic Time Answers