What are the ways igneous rock can form?

Answer 1

intrusive igneous rock: magma cools and hardens in the earth and later forms an intrusive igneous rock.

extrusive igneous rock: magma flows onto earth's surface and becomes lava. Then, lava cools and hardens above earth's surface and later forms an extrusive igneous rock.

Answer 2

Igneous rocks can form through volcanic activity, where molten rock (magma) erupts onto the Earth's surface and cools quickly to form extrusive igneous rocks like basalt. They can also form underground when magma cools slowly, forming intrusive igneous rocks like granite.