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 ...

Experts distinguish minerals based on their crystal structure, which is the specific way in which their atoms or elements ... because we're exploring areas that might have conditions we didn't know ...