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Author Question: What is the most likely cause of the mantle seismic velocity transition zones at 410 and 660 ... (Read 17 times)

brutforce

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on: Jul 16, 2018
What is the most likely cause of the mantle seismic velocity transition zones at 410 and 660 kilometers?
 
  What will be an ideal response?

Question 2

How was the radius of Earth determined? Is Earth a perfect sphere?
 
  What will be an ideal response?


mcni194

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

The most likely cause of the mantle seismic velocity transition zones at 410 and 660 km is high-pressure repacking of the crystal structures of olivine and pyroxene.

Answer to Question 2

Erastosthenes used geometric relationships to determine Earth's radius. This was later refined. Newton recognized Earth would bulge at its equator due to rotation, and calculated its radius, which would later be used to determine its mass, based on gravitational interaction with other planets.


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