The Earth's History

On a geologic column, the oldest rocks

Nearly half the Earth’s valuable mineral deposits are found in rocks from

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

Scattered landmasses on Earth merged into a supercontinent during

What happened when temperatures decreased during the ice ages of the Cenozoic Era?

The first period of the Mesozoic Era was called the

If the Cretaceous Period began about 146 Ma, this means it began

The most common Precambrian fossils are

The mass extinction at the end of the Permian Period led to

The division of geologic time that makes up about 88% of Earth’s history is called

Which of the following accurately characterizes Precambrian rock?

According to the impact hypothesis, dinosaurs became extinct when

Dinosaurs first appeared during the

A geologic period is usually named for

Precambrian time consists of

An armored Cretaceous dinosaur was called the

The Cenozoic Era is known as the

The first geologic column was created by determining the relative ages of sedimentary rock in�

Mountain ranges created during the Cenozoic Era include the

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

Dinosaurs became extinct at the end of the

The Devonian Period is also known as the

The Precambrian rock record is difficult to interpret because

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

The end of the Permian Period was marked by

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

What can a scientist assume about strata that matches a similar layer in a geologic column?

The gradual development of new organisms from preexisting organisms is called

The appearance of many new life-forms during the early Paleozoic Era was aided by

The Pleistocene Epoch was characterized by

Which of the following explains the concept of evolution brought about by geologic change?

The two major groups of dinosaurs during the Jurassic Period were the saurischians and the

The Pliocene Epoch began about 5.3 Ma, or

Precambrian time consists of

The first amphibians appeared during the