Geological Time

The earliest time period in Geological time is

The longest time period of geological time is

The formation of Earth is in the ______________ period.

Multicellular organisms ended in the ____________ period.

The extinction of earliest land plants occurred in the ________ period

The extinction of dinosaurs happened in the

We are in the ___________ period of geological time

Humans first appeared on Earth in the ___________ period.

Which geological period has early animals

Which geological period has middle animals?

Which geological period has recent animals?

Mass extinction has the first of last appearance of certain fossils in a fossil record.