Geologic Time

strata

100

What is strata?

Layers of rock

fossils

100

If you found a fossil in the top layer of a strata, would it be the youngest fossil in the strata?

Yes

200

What is a fossil?

A fossil is any remains of ancient life

Law of superposition

100

Which layer would be the oldest layer, the middle layer, the top layer, or the bottom layer?

The bottom layer

200

Law of superposition states that...

The Youngest rock layer= Top

The Oldest rock layer= bottom

Geo

100

What was first, the earth formation or the earliest sign of life?

The earth formation

200

How old is the earth?

4.6 billion years old

500

When was the earliest sign of life?

3.9 billion years ago

True or False

100

True or false:The dinosaurs lived before humans.

True