A View of Earth's History (Chapter 9)

Question 1

scientists are able to get an absolute age of rocks by using what?

Accepted Answer

radiometric dating

Question 2

the first vertebrates appeared during

Accepted Answer

the Paleozoic Era

Question 3

Most scientists believe that Earth formed about

Accepted Answer

4.6 billion years ago

Question 4

The Age of Mammals is the name commonly given to

Accepted Answer

the Cenozoic Era

Question 5

The theory that a giant meteorite hit Earth causing a mass extinction is called the

Accepted Answer

impact hypothesis

Question 6

A common Mesozoic fossil is called

Accepted Answer

ammonite

Question 7

The Age of Reptiles is the name commonly given to

Accepted Answer

the Mesozoic Era

Question 8

Which time period began about 11,500 years ago and includes our present?

Accepted Answer

Holocene Epoch

Question 9

What time period makes up about 88% of Earth's history?

Accepted Answer

Precambrian Time

Question 10

The period during which land plants such as ferns and cone-bearing plants began to develop was

Accepted Answer

the Devonian Period

Question 11

the most common fossils that occur in precambrian rock are

Accepted Answer

stromatolites

Question 12

Dinosaurs first appeared during the

Accepted Answer

Triassic Period

Question 13

The group of dinosaurs that had the "bird-hip" were called

Accepted Answer

ornothischians

Question 14

Which era is known as the age of reptiles?

Accepted Answer

Mesozoic Era

Question 15

scientists group layers of rocks by looking at it's position and its what?

Accepted Answer

fossil content

Question 16

The geologic time scale is a

Accepted Answer

scale that divides Earth's history into time intervals

Question 17

the most common Precambrian fossils are

Accepted Answer

stromatolites

Question 18

Precambrian time ended about

Accepted Answer

542 million years ago

Question 19

Geologic Periods can be divided into

Accepted Answer

epochs

Question 20

Which time period is known as the Age of Mammals?

Accepted Answer

Cenozoic Era

Question 21

Mountain ranges created during the Cenozoic Era include the

Accepted Answer

Himalayas

Question 22

Dinosaurs became extinct at the end of the

Accepted Answer

Cretaceous Period

Question 23

Scientists have most accurately determined the absolute ages of rock layers by

Accepted Answer

using radiometric dating methods

Question 24

The first flowering plants appeared during the

Accepted Answer

Cretaceous Period

Question 25

Nearly half of Earths valuable mineral deposits are found in rocks from

Accepted Answer

Precambrian Time

Question 26

What can scientists assume about a rock layer that matches other layers in the geologic column?

Accepted Answer

the layers formed around the same time

Question 27

During which time period was Pangaea formed?

Accepted Answer

Paleozoic Era

Question 28

Coal deposits found in Pennsylvania, Ohio, and West Virginia represent fossilized remains of

Accepted Answer

Swamps and forests from the Carboniferous period

Question 29

A variety of life forms appeared in the Cambrian Period due to

Accepted Answer

warm, shallow seas covering the continents

A View of Earth's History (Chapter 9)

Questions 29

A View of Earth's History (Chapter 9)

Questions 29