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Author Question: Plate A and Plate B both consist of only oceanic lithosphere. Plate A is subducting under Plate B. ... (Read 153 times)

ENagel

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on: Jul 16, 2018
Plate A and Plate B both consist of only oceanic lithosphere. Plate A is subducting under Plate B.
 
  Why isn't Plate B subducting under Plate A? Explain you answer
  What will be an ideal response?

Question 2

Which plate contains older lithosphere, A or B? Explain how you know.
 
  What will be an ideal response?


courtney_bruh

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Reply #1 on: Jul 16, 2018
Answer to Question 1

Plate B doesn't subduct under Plate A because it is less dense than Plate A. Density initiates subduction and Plate A is denser than Plate B, so this is why Plate A subducts.

Answer to Question 2

Plate A is older, as it is more dense and subducting. As the plate ages, it cools, gets thicker and gets denser and starts to subduct.


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