Examples of igneous rocks Granite Basalt Pumice Gabbro Metamorphic Rock Type Metamorphic rocks form from a previously existing rock, be it igneous, sedimentary or even an older metamorphic rock ...

Basalt is the most common type of volcanic rock. A pāhoehoe flow is distinguished by its smooth, hummocky, or ropy surface, and is a result of gas-poor magma. When solidified and cooled, the surface ...

Unweathered basalt is black or gray. Basalt magmas form by decompression melting of peridotite in the Earth's mantle, a process discussed in the entry for igneous rocks.

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Revise the characteristics of igneous, sedimentary and metamorphic rocks and how they are formed over a long period of time.

Basalt contains a similar amount of iron to peridotite, an igneous rock common in Earth's mantle but rare in the upper crust. In peridotite, a reaction named serpentinisation produces hydrogen as ...