Igneous rocks are formed by...?

Question

HEAT AND PRESSURE ON EXISTING ROCKS or EVAPORATION OF WATER, LEAVING SOLIDS BEHIND or COOLING AND HARDENING OF MOLTEN ROCK or LAYERS OF MUD ON THE BOTTOM OF A LAKE?

Answer 1

Best Answer - Chosen by Asker

Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from either the Earth's mantle or pre-existing rocks made molten by extreme temperature and pressure changes. Over 700 types of igneous rocks have been described, most of them formed beneath the surface of the Earth's crust. The word "igneous" is derived from the Latin ignis, meaning "fire".

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thanks alot!

Answer 2

volcano's of course.

Answer 3

heat and pressure on existing rocks is metamorphic (diamonds)

layers of mud is sedimentary.

igneous is hardened molten rock from volcanoes.