Term
| Earth's internal structure |
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Definition
| Defined by by chemical composition and physical properties |
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Term
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Definition
| Defined by Crust, Mantle, and Core |
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Term
| Four main layers of Earth |
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Definition
| Lithosphere, Asthenosphere, Mesosphere, Core |
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Term
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Definition
| thick, dense; made up of continental crust and mantle |
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Term
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Definition
| less dense than oceanic crust |
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Term
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Definition
| made of thin oceanic crust and mantle |
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Term
| Evidence that supports Continental Drift |
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Definition
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Term
| Objections against Continental Drift |
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Definition
- No mechanism capable of moving continents
- Wegner suggested they broke through Oceaninc crust
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Term
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Definition
| Composed of relatively rigid plates |
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Term
| Plate tectonics move around the globe |
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Definition
- Change size and shape
- Number of plates change through geologic time
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Term
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Definition
| Driven by heat flow from the mantle |
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Term
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Definition
| Most active crustal processes |
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Term
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Definition
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Term
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Definition
| Are in motion and continually interact with one another |
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Term
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Definition
| Oceanic or an entire continent plus a seafloor |
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Term
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Definition
| major interactions between plates occur along their boundaries |
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Term
| Divergent Plate Boundaries |
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Definition
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Term
| Transform-fault Boundaries |
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Definition
| Conservative margins; slide past one another, no new lithosphere created |
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Term
| Convergent Plate Boundaries |
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Definition
- Destructive Margins
- Subduction occurs
- Results is the collision of continental blocks
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Term
| Oceanic Ridges and Sea-floor Spreading |
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Definition
| Divergent Plate Boundaries |
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Term
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Definition
| elevated seafloor along divergent plate boundary |
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Term
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Definition
| Occurs along oceanic ridge system |
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Term
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Definition
| Downgoing, lithosphere plate |
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Term
| Driving Forces of Plate Tectonics |
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Definition
- Earth's internal heat
- Gravity
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Term
| Deep Ocean Basins: Trenches |
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Definition
- Base of slope along active margins
- Lowest elevation on Earth
- traps sediment
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Term
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Definition
- steep sided volcanoes
- not above sea level
- built by volcanism by ridge/hotspot
- subside due to cooling
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