Part of the Faculty of Social Sciences at the University of Victoria, PACTAC is a pioneering, multidisciplinary research centre, and home to the electronic scholarly journal CTheory, CTheory Archive, and CTheory Multimedia.
Rocks: Rocks are a composed of one or more minerals. A rock can be made up of only one mineral or, as shown in the figure, a rock can be made up of a number of different minerals. So, rocks are composed of one or more minerals and minerals are composed of one or more elements. Previous Item: Why should we study rocks? Go Up: Learn About Rocks
The continental crust is made up of sedimentary, igneous and metamorphic rock. Sedimentary rocks are rocks that have been formed by atmospheric pressure, living organisms and gravity. They are created when sediments consolidate over eons. Igneous rocks are formed by the cooling of magma, found deep in the Earth, or lava flows.