A DISCUSSION on the origin of igneous rocks was held in Section C (Geology ... present knowledge concerning the geological history, structure and thermal condition of the earth's crust.

Igneous intrusions are a type of rock feature. They form when molten rock cools below the surface of the Earth. Join Isla and Connor as they explore igneous rock landscape features at Traprain Law ...

While some minerals like halite have relatively simple crystal structures, others can contain 10 or more elements, such as khomyakovite and georgbarsanovite. "We're constantly finding new minerals, ...