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Fossils
Term | Definition |
---|---|
Uniformitarianism | A change that happens slowly. |
Catastrophism | A change that happens all of a sudden. |
Original Horizontality | All layers have to be horizontal. |
Law of Superposition | It states that the oldest layer is on the bottom and the younger is on the top. |
Relative Dating (age) | Around the age by the law of superposition |
Absolute Dating (age) | The exact age |
Index Fossil | A fossil that lived short. |
Petrified fossil | When water flows throw and hardens it. |
Trace Fossil | The actions of a fossil |
Mold | It is concave and is a imprint of the fossil |
Cast | It is convex and is a copy of the fossil. |