fossils and unconfor
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each of the black spaces below before clicking
on it to display the answer.
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| Absolute Age | The exact age of a rock or fossils
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| Angular unconformity | When there is movement of the earth that turns the rock layers at an angle.
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| Anticline | An upward fold of rock
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| Crosscutting | Intrusive magma or lava is always younger than the existing rock.
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| Elastic limit | the amount of heat and pressure rock can withstand before breaking.
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| Extrusion | Lava that hardens on the surface
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| Folding | When heat and pressure bends a rock
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| Fossils | The preserved remains or traces of an organism
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| index fossils | Useful fossils that help determine the age of other fossils or rock layers. They must 1) have lived and died in a relatively short period of time and 2) They need to be widely distributed.
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| Intrusion | Magma cooled and hardened into a mass of igneous rock.
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| Lava | Flow from the mantle that is on top of the crust
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| Law of Inclusion | When rock layers have bits of the rock layer below it, it must be younger than the one below it.
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| Magma | Flow from the mantle that is inside the crust
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| Relative Dating | Determining the relative age of rock layers or order of past geologic events
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| Relative Age | The approximate age of a rock layer or fossil
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| Syncline | A downward fold of rock
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| Strata | Rock layers
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| The Law of Superposition | In an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom.
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| Unconformity | represent gaps in the geologic record; periods of time that are not represented by any rocks.
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