Obsidian Is an Igneous Rock with a Glassy Appearance and Minimal

question 40

Multiple Choice

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

• A)Obsidian is an extrusive igneous rock that cooled rapidly on Earth surface,resulting in little crystal growth.
• B)Obsidian is an intrusive igneous rock that cooled rapidly beneath Earthʹs surface,resulting in little crystal growth.
• C)Obsidian is an intrusive igneous rock that cooled slowly beneath Earthʹs surface,resulting in little crystal growth.
• D)Obsidian is an extrusive igneous rock that cooled very slowly on Earth surface,resulting in little crystal growth.

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