Test Review: History of Earth

Fossil A is older than fossil B

Fossil C is 50 million years old

Fossil D is older than the last mass extinction

There is no way of determining absolute age

Layer A is older than layer B

The sediments in layer B were deposited before those in layer A

Layers A and B are probably about the same age

Layer B contains more radioactive isotopes than layer A

A

B

C

D

2000

4000

6000

8000

along the edges of the continents

at the north and south poles

along the mid-ocean ridge

in deep ocean trenches

Evidence from fossils

Evidence from human remains

Evidence from landforms

Evidence from climate