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12 Cards in this Set

  • Front
  • Back
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.