Intro to Astronomy
Obsidian is a naturally occurring volcanic glass formed by the rapid cooling of silica-rich lava. It is a hard, black, or dark-colored igneous rock that is commonly used in various applications, including tools, weapons, and decorative items. Obsidian is particularly relevant in the context of Earth's crust, as it is a key indicator of volcanic activity and the geological processes that shape the planet's surface.
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