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Unit 2 Biology (Higher) > Fossils > Flashcards

Flashcards in Fossils Deck (6)
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What is a fossil?

The remains of organisms found in rocks.

1

Name three ways fossils form.

Gradual replacement by minerals, from casts and impressions and preservation where decay doesn't occur.

3

What is gradual replacement?

Where things like teeth, bones and shells are replaced by minerals that leave a rock-like substance, creating a fossil.

4

How do casts and impressions create fossils?

When an organism is buried in a soft material like clay, the clay hardens as the organism decays and leaves a cast/impression of the organism.

5

How does preservation create fossils?

Areas or materials, like glaciers where it's too cold for decay microbes to work, stop organisms from decaying.

6

What do fossils show?

How organisms have evolved over time.