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Author Question: How do the holes form in vesicular igneous rocks, such as scoria and pumice? What will be an ideal ... (Read 58 times)

nevelica

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on: Jul 15, 2018
How do the holes form in vesicular igneous rocks, such as scoria and pumice? What will be an ideal response?

Question 2

What does a porphyritic texture tell us about the history of an igneous rock? What will be an ideal response?


recede

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Reply #1 on: Jul 15, 2018
Answer to Question 1

They result from the entrapment of gases that come out of the liquid magma when the pressure is
released.



Answer to Question 2

The magma cooled at two rates: first slowly, probably underground, and then more rapidly.


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