Short Answer
This rock is ____[1]______,an [2] [3] rock that forms when nongaseous [4] cools so fast crystals cannot form.
Answer 1 Choices
basalt
granite
obsidian
Answer 2 Choices
extrusive
intrusive
Answer 3 Choices
igneous
metamorphic
sedimentary
Answer 4:
lava
magma
Correct Answer:

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Answer1: obsidian
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