Fossils
- Created by: Laurenskye
- Created on: 10-05-16 15:25
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- Fossils
- Gradual Replacement by Minerals
- 1. Hard parts don't decay easily so can last a long time when buried
- 2. They eventually replaced by minerals as they decay, forming a rock like substance.
- 1. Hard parts don't decay easily so can last a long time when buried
- Casts and Impressions
- 1. Sometimes fossils are formed when an organism is buried is soft material like clay.
- 2. The clay later hardens around it and the organism decays leaving a cast.
- 3. Things like footprints can be pressed into these materials when soft, leaving an impression when it hardens
- 2. The clay later hardens around it and the organism decays leaving a cast.
- 1. Sometimes fossils are formed when an organism is buried is soft material like clay.
- Preservation
- Amber - no oxygen or moisture so decay microbes cant work.
- Glaciers - too cold for decay microbes to work
- Peat bogs - too acidic for decay microbes to work.
- How life began
- There is a lack of valid and reliable evidence for how life began
- Scientists believe this is because there were many soft bodied organisms so the fossil record is incomplete.
- some fossils will have been destroyed by geological activity
- Scientists believe this is because there were many soft bodied organisms so the fossil record is incomplete.
- There is a lack of valid and reliable evidence for how life began
- Gradual Replacement by Minerals
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