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Author Question: Explain why there would be no volcanoes on Earth without convection. What will be an ideal ... (Read 122 times)

magmichele12

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on: Jul 16, 2018
Explain why there would be no volcanoes on Earth without convection.
 
  What will be an ideal response?

Question 2

Explain the factors that determine whether or not convection occurs.
 
  What will be an ideal response?


cuttiesgirl16

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

The decompression of rising rock lowers its melting point while only lowering its temperature a small amount. The rock is now above its melting point and it begins to melt. Upward movement to cause decompression results from convection.

Answer to Question 2

Viscosity, gravity, and temperature are important controls on convection. Gravity causes the cooler, denser material to sink, whereas viscosity inhibits motion of the mass. Convection is favored by those conditions which overcome viscosity, including large mass, long time, and higher temperatures.


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