Fossils
- Created by: adelesimpson
- Created on: 17-04-16 12:53
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- How they are formed
- Fossils
- How life on Earth was formed
- Scientists can't be sure how life began - lack of valid evidence as fossil record is incomplete
- Many early life forms were soft bodied so they left few traces behind
- Primordial soup theory
- Involves interaction between methane, ammonia, hydrogen and lightening in the early atmosphere
- Thought that lightening could have caused a chemical reaction between gases, resulted in the formation of amino acids
- Amino acids are the building blocks for proteins, the amino acids could then have combined to form organic matter in the primitive oceans
- Thought that lightening could have caused a chemical reaction between gases, resulted in the formation of amino acids
- Involves interaction between methane, ammonia, hydrogen and lightening in the early atmosphere
- How life on Earth was formed
- From hard part of animals that don't decay easily - bones and shells
- From parts of organisms that have not decayed because the conditions for decay are absent
- When parts of the organism are replaced by minerals as they decay - forms a rock-likeb substance in the shape of the dead remains
- As preserved traces of organisms - may become covered by sediments, form rocks over millions of years
- When parts of the organism are replaced by minerals as they decay - forms a rock-likeb substance in the shape of the dead remains
- Fossils
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