The mineral is colorless in its pure form, but impurities can either make quartz crystals appear opaque or stain them pink ... are three main types of rock — igneous, sedimentary and metamorphic ...

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 ...

There are three main types of rock: igneous rock, metamorphic rock, and sedimentary rock. Almost all fossils are preserved in sedimentary rock. Organisms that live in topographically low places (such ...