Earth History and Processes

4.6 billion

4.6 million

46 billion

46 million

All the fossils on earth

A fossil that characterizes a particular period of time.

Any remains, trace, or imprint of animal or plant life preserved in Earth's crust.

Fuel formed by natural processes over long periods of time.

A recorded device made out of fossils.

A piece of music that is about fossils.

A scroll that pictures all the fossils in North America.

All the fossils on Earth.

The largest division of geologic time.

A subdivision of a geologic period.

A broad span of geologic time based on the general type of life existing during that time.

A community of organisms interacting with each other and with the nonliving environment.

A span of time within an era.

A subdivision of a geologic period.

A broad span of geologic time based on the general type of life existing during that time.

A community of organisms interacting with each other and with the nonliving environment.

The time we started studying geology.

The period of time ranging from the formation of Earth about 4.6 billion years ago to today.

A clock that shows when different rocks were formed.

A clock made out of rocks.

An era when mammals exist; means "recent animal life"

An era when dinosaurs existed; means "middle animal life"

An era when trilobites, corals, brachiopods, early fish, and early amphibians existed; means "ancient animal life"

All of the time before the Paleozoic era.

An era when mammals exist; means "recent animal life"

An era when dinosaurs existed; means "middle animal life"

An era when trilobites, corals, brachiopods, early fish, and early amphibians existed; means "ancient animal life"

All of the time before the Paleozoic era.

An era when mammals exist; means "recent animal life"

An era when dinosaurs existed; means "middle animal life"

An era when trilobites, corals, brachiopods, early fish, and early amphibians existed; means "ancient animal life"

All of the time before the Paleozoic era.

An era when mammals exist; means "recent animal life"

An era when dinosaurs existed; means "middle animal life"

An era when trilobites, corals, brachiopods, early fish, and early amphibians existed; means "ancient animal life"

All of the time before the Paleozoic era.