History of Planet Earth

Front

What does 'sample' mean?

Back

A small amount of material used for observation.

Front

What does 'horizontal' mean?

Back

Runs parallel to the Earth's surface.

Front

What is a fossil?

Back

The mineralized remains or evidence of plants and animals that lived long ago.

Front

What does 'extinct' mean?

Back

When the last member of a species has died.

Front

What is the first step in the fossil formation process?

Back

An organism dies.

Front

What happens after an organism dies in the fossil formation process?

Back

Soft tissue decays.

Front

What occurs after soft tissue decays in the fossil formation process?

Back

Bones are replaced by minerals.

Front

What is the final step in the fossil formation process?

Back

A fossil forms.

Front

What are rock layers?

Back

Layers of rock that have formed over time, often containing fossils.

Front

What is a key bed?

Back

A specific layer of rock that is used as a reference point in geology.