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fossils and unconfor

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