one of the common minerals that make up most of the rocks of earth's crust.
a light-colored rock that has high silica content. Counter-tops are often made out of this.
give the rock it's texture. They vary in size, shape and pattern.
the look and feel of the rock's surface.
forms when magma or lava cools and hardens.
the molten mixture of rock-forming substances, gases, and water from the layer of hot, solid material between earth's crust and core.
forms when pieces of rock are pressed and cemented together. Also comes from the remains of plants and animals pressed together. Layers are buried below the surface.
forms from other rocks that are changed by heat and pressure. Usually forms deep underground.