Basalt

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Basalt. 1 connected concept: Mare Tranquillitatis (related to).

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Community · Mare Tranquillitatis

Summary

Basalt ; buh-SALT) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron exposed at or very near the surface of a rocky planet or moon.

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Connections1

primary geological composition of the mare
The dark appearance of Mare Tranquillitatis is due to its composition of iron-rich basaltic lava flows that filled the basin billions of years ago.
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Facts