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Author Question: Natural glass such as obsidian forms when ____. A)magma cools too rapidly for crystals to form ... (Read 212 times)

rlane42

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on: Jul 13, 2018
Natural glass such as obsidian forms when ____.
 A)magma cools too rapidly for crystals to form
 B)pegmatite melts, moves to Earth's surface and ,re-forms
 C)magma cools too slowly for crystals to form
 D)magma has a very low silica content
 E)gas escapes through lava

Question 2

Stromatolites are the product of organic activity.
  Indicate whether the statement is true or false


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Smiles0805

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Reply #1 on: Jul 13, 2018
Answer to Question 1

A

Answer to Question 2

True


rlane42

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Reply 2 on: Jul 13, 2018
Gracias!

Animal_Goddess

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Reply 3 on: Yesterday
Excellent

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