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Author Question: How do oceanic and continental crusts differ? How do scientists know that they are different? ... (Read 35 times)

imowrer

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on: Jul 16, 2018
How do oceanic and continental crusts differ? How do scientists know that they are different?
 
  What will be an ideal response?

Question 2

How do we get samples of rocks from the crust that formed deeper than 5 kilometers below Earth's surface?
 
  What will be an ideal response?


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vickyvicksss

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

There is a variation in composition and density, and thickness. Drilling into the sea floor and continental crust, and detection of ophiolites, where oceanic crust is accreted to continental material, provide opportunities to study the crust directly. Seismic reflection and refraction allow them to image the lithosphere.

Answer to Question 2

Drill-hole data, surface of outcrops of rocks that formed at depth but are now exposed on Earth's surface and rocks brought up from depth within volcanic rocks.


imowrer

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Reply 2 on: Jul 16, 2018
Thanks for the timely response, appreciate it

marict

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Reply 3 on: Yesterday
Excellent

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