How is a igneous rock formed?

Answer 1

When magma, which is molten rock, cools, igneous rock forms. This can happen as a subsurface event, or it can occur as exposed magma solidfies at the surface after it emerges. The number of different "types" of rock that are formed are as varied as the material from which it forms, and are also affected by the way the rock cools. Use the link below and pick up more information at Wikipedia.

By cooling magma and lava ! A+

Answer 2

"Igneous" refers to rocks of volcanic origin. "Extrusion" refers to the process of a material being forced through a cavity of another material. (Think "Play-Doh Fun Factory." :) ) So, extruded igneous rocks are formed when liquid magma (volcanic rock) is forced through an opening (like a volcanic vent) and then cools and hardens into volcanic rock.

Answer 3

Igneous rock is formed from lava that has cooled and, of course, hardened.

Answer 4

they are formed by liquid rock which is called magma

Answer 5

By the solidification, and crystallization of lava on the Earth's surface.