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Author Question: Which minerals usually give mafic and ultramafic rocks their dark colors? A) plagioclase feldspar ... (Read 43 times)

leilurhhh

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on: Jul 16, 2018
Which minerals usually give mafic and ultramafic rocks their dark colors?
 
  A) plagioclase feldspar and pyroxene
  B) amphibole and pyroxene
  C) olivine and pyroxene
  D) plagioclase feldspar and olivine

Question 2

A scientist identifies a rock sample as basalt. Why did he do so?
 
  A) He observed that the rock has a lot of silica, making it mafic.
  B) He observed that the rock has a lot of silica, making it ultra-mafic.
  C) He observed that the sample has little silica, making it felsic.
  D) He observed that the sample has little silica, making it mafic.


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Ksh22

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

Answer: C

Answer to Question 2

Answer: D


leilurhhh

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Reply 2 on: Jul 16, 2018
Gracias!

kusterl

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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