We Distinguish Between a Mineral and a Naturally Formed Glass

question 24

Multiple Choice

We distinguish between a mineral and a naturally formed glass (such as obsidian) because

• A) glass is not produced by geologic processes.
• B) glass is organic.
• C) glass does not have a fixed crystal structure.
• D) glass can be made synthetically as well as occur naturally.

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Definitions:

Pacific Ring

A region encircling the Pacific Ocean characterized by active volcanoes and frequent earthquakes, known as the Pacific Ring of Fire.

Fire

A rapid oxidation process, which is a chemical reaction resulting in the release of heat and light.

Island Arcs

Chains of islands formed close to continental margins over a subduction zone where one oceanic plate is forced under another.

Continental Plates

Large landmasses made of continental crust, floating on the viscous upper mantle of the Earth, and continually moving due to tectonic processes.