Geologic Record (#1) Word Scramble
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| Term | Definition |
| How old is the Earth? | 4.6 billion years old |
| Catastrophism | theory that Earth's surface has been largely shaped by sudden, violent events |
| Examples of catastrophic events | massive floods, super volcanoes, mega earthquakes |
| mass extinction | when many species die out in a short period of time |
| Uniformitarianism | theory that slow forces shaped Earth's surface over a LONG period of time |
| Examples of uniformitarianism | wind and water erosion, glaciation, deposition of mud, lava cooling to rock |
| James Hutton | Scientist who made uniformitarianism popular |
| Geologic Time Scale | Earth's history divided by major events and changes on Earth |
| Trace Fossil | A fossilized mark that is formed in soft sediment by the movement of an animal. |
| fossil | The remains or physical evidence of an organism preserved by geological processes. |
| sedimentary rock | Fossils are commonly preserved in what type of rock? |
| What parts of organisms are typically fossilized? | Hard-parts -- like bones and shells |
| Index fossil | Fossils that are used to date a layer of rock or other nearby fossils |
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