The structure and boundaries of a watershed can be identified on topographic maps, relief maps, and aerial photos. Cartographers are map-makers. Humans effect the processes of erosion and deposition. People can choose to restore and conserve soil and landforms. Rocks and mineral have observable properties.
Rocks are mixtures of minerals.
Rocks exhibit a variety of properties including shape, size, color, and texture. Minerals have different properties such as color, scratchability, and luster. Minerals cannot be physically separated into other materials. Properties of minerals are used to find out which minerals make up a rock. Geologists study the earth and the materials of which it is composed.