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31 Cards in this Set
- Front
- Back
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Eon |
All time |
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Era |
Before life |
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Period |
Life evolution |
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Epoch |
Since last extinction |
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Uniformitarianism |
Assumes that the same physical processes active in the environment today have been operating throughout geologic time. |
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Catastrophism |
Theory that the Earth has been affected in the past by sudden, short-lived, violent events, possibly worldwide in scope. |
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Half life geologic dating |
Radioactive decay and half life |
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Crust |
Oceanic and continental, earth's outermost shell of crystalline surface rock. |
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Mantle |
Lower and upper (80% of earth's mass), denser and tightly packed at depth, grading to lesser densities toward and the surface. |
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Core |
Inner and outer. Inner core is solid iron and nickel, and outer core is molten, metallic iron |
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Lithosphere |
Includes the crust, the upper mantle (rigid part), and moho |
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Aesthenosphere |
Upper viscous mantle on which the lithosphere floats. Plastic layer |
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Mohorovičić discontinuity |
The boundary between the crust and the high velocity portion of the lithosphere upper mantle. |
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Continental crust |
Granite, lower density, lighter color |
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Oceanic crust |
Basalt, higher density, and darker color |
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Isostacy |
Explains certain vertical movements of Earth's crust. |
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Subduction |
An area where two plates of crust collide and the denser oceanic crust goes beneath the less dense continental plate, forming deep oceanic trenches. |
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Tectonic cycle |
Rising magma, sea floor spreading, subduction, continental crust formation |
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Rock cylce |
Igneous, metamorphic, and sedimentary |
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Igneous rock |
Form from magma and it solidifies and crystallizes. |
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Sedimentary rock |
Are derived from existing rocks or from organic materials such as bone and shell. |
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Metamorphic rock |
Any rock can be transformed into this by going through profound physical and or chemical changes under pressure and increased temperature. |
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Magma |
Composed of molten rock and is stored in the Earth's crust. |
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Lava |
Is magma that reaches the surface of our planet through a volcano vent. |
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Plate tectonics |
Is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. |
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Pangea |
A supercontinent that existed during the late Paleozoic and Mesozoic era. |
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Gondwana |
Part of Pangaea made up the Southern Hemisphere countries. |
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Laurasia |
Northern part of Pangaea make up most of the northern hemisphere. |
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Divergent |
Sea floor spreading |
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Convergent |
Subduction |
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Transform |
Lateral sliding |
