When lava cools and solidifies.
Igneous Rocks - Rocks formed by crystallization from a melt (magma)
Extrusive igneous rocks.
Igneous rocks are formed as the result of cooling magmas.
igneous
Intrusive igneous rocks are thusly formed.
No. Igneous rock is formed from cooling lava or magma.
Igneous rocks are formed by the solidification of molten materials.
That is correct.
No.
Igneous rock is formed when lava or magma cools.
igneous rocks
Igneous rocks are formed by heat, pressure and cooling. They can be formed inside a volcano or outside a volcano. If they are formed outside the volcano the rocks are called extrusive igneous rocks, like basalt. If it is formed inside the volcano the rocks are called intrusive igneous rocks, like granite.