________ is molten rock that is below the Earth's surface and ...

[strangeaffliction]

________ is molten rock that is below the Earth's surface and retains most of its volcanic gases.
 
  A) Lava
  B) Pumice
  C) Magma
  D) Volatiles

Question 2

Describe how magnesium can be exchanged for iron in olivine without destroying the internal framework of the mineral.
 
  What will be an ideal response?

[sylvia]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: Magnesium and ferrous iron both have charges of 2+, so they can be switched in the mineral structure without too much trouble because the ions are roughly the same size.

[strangeaffliction]

Thanks for the timely response, appreciate it

[cpetit11]

Great answer, keep it coming