Front

In which time period are we currently living? Precambrian Time, Paleozoic Era, Mesozoic Era, Cenozoic Era

Back

Cenozoic Era

Front

Ancient bacteria called stromatolites are one of the oldest species on Earth. In what Era did they first appear?

Back

Precambrian

Front

Dinosaurs, small mammals, and birds are found in this time period.

Back

Mesozoic

Front

What are fossils that are abundant, easily recognizable, short lived, and widespread called?

Back

Index fossils

Front

Preserved remains of plants and animals from the remote past are called?

Back

Fossils

Front

The Law of Superposition states

Back

Younger rocks layers are on top of older rock layers

Front

Which era was the longest, taking up about 90% of geologic time?

Back

Precambrian

Front

Mr. Kirby is older than his sister, this is an example of?

Back

Relative age dating

Front

What divides the Eras on the Geologic Time Scale?

Back

Mass extinctions

Front

The end of the Mesozoic Era was most likely caused by?

Back

An asteroid impacted the Earth