Igneous rock is formed by the cooling of molten rock, either at the surface (lava), or underground (as granite or other similar rocks). The heat of molten rock usually incinerates organisms rather ...

Molten rock is rock that has been heated to ... Granite is an intrusive igneous rock. Granite has large crystals which can be easily seen with the naked eye. This makes it attractive and useful ...

Minerals are typically formed when molten rock, or magma, cools ... iron, marble, and granite. Silicates—including quartz, mica, olivine, and precious minerals such as emeralds—are the ...