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
Sandstones are rocks composed primarily of sand grains. The grains of sand in a sandstone are usually particles of mineral, rock or organic material that have been reduced to sand size by weathering and transported to their depositional site by the action of moving water, wind or ice.he grains of sand in a sandstone are usually particles of mineral, rock or organic material that have been reduced to sand size by weathering and transported to their depositional site by the action of moving water, wind or ice.