Answer:plate tectonics
Explanation: Because plate tectonics moved around the continents and they were moved to different locations which caused the climate change
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<span>A. Unsaturated fatty acids have double carbon bonds</span>
Answer:
covalent bond
Explanation:
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Answer:
Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known as a "mineraloid." The result is a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture (see photo).
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