Fossils
- Created by: Avalonr
- Created on: 21-07-15 08:29
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- Fossils
- Original Fossils
- Form when part of the organism is preserved with its chemical compact staying mostly the same.
- The bone structure (calcium Carbonate) ensures that the bone doesn't decay.
- Replacement Fossils
- When part of the dead organism's chemical structure changes.
- They take a long time to form. The ones found seem to be around 60 million years old
- Forms when the calcium is changed into silica
- Sometimes turns into opal
- If the preserved organism is wood then it is called to be petrified
- For this change to occur it depends on the enviornment surrounding the organism
- Carbon Film
- Occurs when the dead organism only partly decays and leaves a black line of carbon
- Shows finer detail
- Sometimes coal can be formed in the process, meaning no trace of the fossil
- Indirect Fossils
- Original Fossils
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