basalt

[noun]

A dark, fine-grained igneous rock formed by cooling of iron- and magnesium-rich lava above the surface of the earth. Basalt is the main component of the oceanic crust of the Earth.

Appears in modules:

Defining Minerals Composition and crystal structure
Earth Structure A virtual journey to the center of Earth
Origins of Plate Tectonic Theory From early ideas to mapping the ocean floor
The Rock Cycle Uniformitarianism and recycling

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