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Author Question: A volcanologist extracts a piece of rock near a volcano site and observes no visible crystals. After ... (Read 32 times)

danielfitts88

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on: Jul 16, 2018
A volcanologist extracts a piece of rock near a volcano site and observes no visible crystals. After studying the rock for a while, he assumes it is obsidian. Why does he do so?
 
  A) Obsidian is always hot.
  B) Obsidian forms underground.
  C) Obsidian is green.
  D) Obsidian forms in lava flows.

Question 2

Why should a student on a field trip in Yosemite National Park assume that a piece of rock, that when under a microscope shows tiny crystals, is basalt?
 
  A) Basalt forms in lava flows.
  B) Basalt forms underground.
  C) Basalt is green.
  D) Basalt is always hot.


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FergA

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

Answer: D

Answer to Question 2

Answer: A


danielfitts88

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Reply 2 on: Jul 16, 2018
Thanks for the timely response, appreciate it

peter

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

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