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| the science and study of planet earth. |
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| A series of actions or operations that lead to a end result. |
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| Early scientist explained earth's history as a series of disastrous events that occurred over short periods of time. |
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| The time scale that helped geologists correlate rock units across countries and continents and have a standard model and vocabulary for describing geological time. |
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| Well established; widely recognized as a acceptable. |
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| states that geologic processes that occur today are similar to those that have occurred in the past. |
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| A large mass of ice that moves slowly over land. |
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| The actual age of the events. |
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| is the age of rocks and geologic features compared with other rocks and geologic features nearby. |
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| something that is formed or created. |
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| they helped geologists organize rocks according to their relative ages. |
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| is the principal that in undisturbed rock layers. The oldest rocks are on the bottom and the younger rocks are on the top. Example: A pile of dirt clothes. |
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| most rock formations are deposited in horizontal layers. |
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the principal that sediments are deposited,
in large flat sheets. Example: a river might erode the layers, but the order of the rivers will not change. |
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| When rocks move along a fracture line. |
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| Cross Cutting relationships |
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| if one geologic feature cuts across another feature, the feature that it cuts across is older. |
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| the entry of magma into or between rock formations |
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| To change the position or order of something |
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| A piece of a older rock that becomes part of a new rock.. |
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| are the preserved remains of evidence, of ancient living things. |
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| What can the fossil record tell us about Earth's history? |
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1. shows us that there has been an overall increase in the complexity of organisms over time
2.The fossil record shows us when specific types of organisms appeared, went extinct, or changed.
3.shows us that there have been mass extinctions in Earth’s past |
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| Times when many species died or became extinct in a short period of time. After years, they became fossils. |
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| to change in order to succeed in a new situation. |
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| Eath is aproximatly ______ years old |
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| How is the law of superposition used to determine relative age of rock layers? |
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| Layers of rock are superimposed or laid down one on top of the other |
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| Explain how an older rock could appear on top of a younger rock |
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| Thrust faulting from where rocks are compressed. |
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| when an older rock formation has been eroded before a younger rock layer is laid down. |
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