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Earth History
| Question | Answer |
|---|---|
| numeric age of a rock or layer of rocks or fossils determined by radiometric dating | absolute age |
| largest division on the Geologic Time Scale | Eon |
| Animals of a given region or period of time | fauna |
| Plants of a given region or period of time | flora |
| All of the fossils that have existed throughout Earth's hostory, all current paleontological knowledge | Fossil Record |
| a person who studies ancient life, fossils | paleontologist |
| The age of a rock layer or fossil compared to other layers or fossils around it | relative age |
| method used to determine absolute age of a rock by using the breakdown of radioactive elements | radiometric dating |
| How old we think the Earth is right now | 4.6 billion years old |
| any fossilized sign or proof that an organism was there, like a footprint or poop, but not the actual organism | trace fossil |
| Eons are divided first into these based on major events like mass extinctions | Eras |
| The largest partof the Geologic Time Scale is this Eon. It contains the time when the Earth was forming its geosphere, hydrosphere, and atmosphere. We also know the least about it. | Precambrian |
| This Era of Geologic Time comes to an end with the larges mass extinction in Earth History. It was an era of diverging life and animals and plants moving onto land. | Paleozoic Era |
| This Era of Geologic Time ends with the mass extinction that included the dinosaurs. The era includes the Triassic, Jurassic, and Cretaceous periods in which the dinos rose to dominance. | Mesozoic Era |
| This Era of Geologic Time has not ended. It is the time of the Mammal. This is the era that has the evolution of madern man. | Cenozoic Era |
| The majority of life, both plant and animal, on Earth become extinct over a fairly short period of time. | Mass Extinction |
| In a layer of undisturbed sedimentary rock the layer of rock on the top is always _____________ than the layer of rock on the bottom | younger |
| The law that explains that in layers of sedimentary rock that are undistrubed the layer on the top is always younger than the layer on the bottom is called what? | The law of superposition |
| The surface of the Earth is made up of fractured pieces of crust that are in constant movement and have moved throughout Earth's history. | Theory of Plate Tectonics |
| Species change over time. Living things evolve in response to changes in their environment. | Theory of Evolution |
Created by:
jbrown5869
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