additional biology-fossils Flashcards
1
Q
what are fossils
A
the remains of plants and animals
2
Q
name the three ways fossils form in rocks
A
- gradual replacement of minerals
- casts and impressions
- preservation
3
Q
what is the gradual replacement of minerals
A
-teeth etc don’t decay they are replaced by minerals forming a rock like substance
4
Q
what is cast and impression
A
when clay hardens leaving a cast of a shape
5
Q
what is preservation
A
where no decay happens
