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Author Question: When looking at a hand sample of an igneous rock, how would you tell if it is plutonic or volcanic? ... (Read 66 times)

penza

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on: Jul 15, 2018
When looking at a hand sample of an igneous rock, how would you tell if it is plutonic or volcanic? What will be an ideal response?

Question 2

Briefly explain batholith formation. What will be an ideal response?


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Bison

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

ANS:If
the texture is phaneritic, the magma cooled slowly, and the rock is plutonic. If the texture is
aphanitic, the magma cooled rapidly, and the rock is volcanic.



Answer to Question 2

Most batholiths appear to have formed by upward intrusion of magma accompanied by fracturing and
stoping, and the shouldering-aside and deformation of intruded country rock.



penza

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Reply 2 on: Jul 15, 2018
Great answer, keep it coming :)

triiciiaa

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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