Answer:
A. Obsidian
Explanation:
It fits the property described in the question.
It cools so fast that no visible crystal or grain could form. It has high silica Composition, black and glassy. It is also used to make tools with sharp edges
Answer:
equator
Explanation:
it is in the center of the globe
<span>Good Morning!
The atmospheric layer closest to us is the troposphere.
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