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8.3 Sedimentary Rocks (Formation of fossils (A fossil may be the whole…
8.3 Sedimentary Rocks
Formation of fossils
A fossil may be the whole body of the organism or just a part of it, a fossil can also be traces of an organism's activities, such as its burrows or tracks
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Jellyfish, slugs, algae and mosses are organisms that are composed of soft parts only
The hard parts of organisms such as dinosaurs, giant kangaroos, crabs, shellfish and trees can be fossilised
When an organism dies, it remains can be eaten, weathered away, or left to decay, if decays are quickly covered by sediment, they are not likely to be eaten
If there is oxygen in the sediment, the remains can be preserved, these conditions most often occur at the bottom of an ocean, lake or river
If an organism is turned into rock, ir has been petrified and becomes a fossil
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