Introduction -- Physical properties of magma -- Intrusion of magma -- Forms of igneous bodies -- Cooling of igneous bodies and other diffusion processes -- Classification of igneous rocks -- ...

Igneous rocks are Earth’s original rocks. They form when magma (molten rock within the Earth) or lava (at the surface) cools to stone. The composition of the rock that melts and where that melt later ...

A new atlas charts the global distribution of unusual, critical-metal-bearing igneous rocks, finding that they often form near the thick and ancient cores of the world's major continents. Researchers ...