A Geological Time Scale is divided into ...

In which period did major groups of animals suddenly appeared?

The most recent eon.

A transition fossil that has both reptile and bird features.

Large reptiles that became extinct about 65 million years ago.

The movement of land masses during the history of the Earth.

The person who studies fossils is called ...

A period in the earth's history where global temperatures decreased and there was glaciation is known as ...

The Phanerozoic eon is divided into how many eras?

Which one is the longest ime periods?

The Earth used to be one land mass or called ...

The remains of once living things that are usually preserved in rocks.