G&G100a Chapter 4
Terms
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- What is the lithosphere?
- The strong outer layer of the earth
- What is the asthenosphere?
- The weaker, more fluid internal layer of the earth
- What is isostasy?
- Loads on the earth's surface are supported by buoyancy. The low-density crust floats relative to the high-density mantle of the asthenosphere.
- What are divergent boundaries?
- Rides/spreading centers
- What are convergent boundaries?
- Subduction zones
- What are conservative boundaries?
- Transform faults
- Why does the ocean floor have a magnetic pattern?
- When lava cools to below 550, atoms line up in the direction of earth's magnetic field
- Smaller earthquakes occur at
- spreading zones
- Larger earthquakes form at
- transform faults
- Gigantic earthquakes form at
- Subduction zones
- The break up of the African continent will be caused by
- The three rift zones in the Red Sea, East African Rift Valley, and the Gulf of Aden
- What is the rift-to-drift sequence?
- The formation of a new spreading center. 1.) Rise of hot asthenosphere. 2.) Extension of lithospehre due to heating. 3.) Litosphere is rifted apart. 4.) New lithosphere created.