Obsidian Is an Igneous Rock with a Glassy Appearance and Minimal

question 39

Multiple Choice

Obsidian is an igneous rock with a glassy appearance and minimal crystal growth.What accounts for this?

• A)Obsidian is an intrusive igneous rock that cooled slowly beneath the Earth's surface,resulting in little crystal growth.
• B)Obsidian is an extrusive igneous rock that cooled slowly on the Earth surface,resulting in little crystal growth.
• C)Obsidian is an extrusive igneous rock that cooled very slowly on the Earth surface,resulting in little crystal growth.
• D)Obsidian is an intrusive igneous rock that cooled rapidly beneath the Earth's surface,result in little crystal growth.
• E)Obsidian has a chemical composition that lends itself to a glassy appearance and minimal crystal growth.

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