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Basalt is the igneous rock which makes up most of the ocean floors. It is smooth and velvety-black in appearance and very hard. New seafloor is constantly produced at the mid-ocean rifts, where areas between spreading tectonic plates are infilled with rapidly cooling lava.

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Why are basalt and granite important igneous rock?

As it turns out, most of the ocean floor is basalt, and most of the continents are granite.


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