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Author Question: Draw a cross-section of an oceanic-oceanic convergent plate boundary. Show the directions of ... (Read 41 times)

plus1

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on: Jul 15, 2018

Draw a cross-section of an oceanic-oceanic convergent plate boundary. Show the directions of relative
  plate motion. Put stars for the locations of earthquakes. Put triangles with smoke out the top for the
  locations of volcanoes. Label the trench, back arc basin, and subduction complex What will be an ideal response?



Question 2

Briefly describe what happens when divergent plate boundaries form within a continent. What will be an ideal response?


nickk12214

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Reply #1 on: Jul 15, 2018
Answer to Question 1

See Figure 2.19a.

Answer to Question 2

High heat flow elevates the continent and a rift valley forms, with normal faults and a central valley
called a graben. Magma is intruded into fractures. As the plates diverge, basalt erupts in the rift,
creating new ocean crust. Ultimately, as the plates continue to diverge, a new ocean basin forms.



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