Chloroplasts are the organelles other than the nucleus and mitochondria that contain their own DNA. Chloroplasts are found in plants and certain forms of protists. Their DNA and ribosomes are located in the stroma.
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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