Rock-forming Minerals - 20 or so minerals that make up most of the rocks of Earth's crust, Granite - A light-colored rock having a high silica content., Basalt - A dark colored rock that is low in silica., Grains - The particles of minerals OR other ROCKS that make up the rock., Texture - The look and feel of the rock's surface (size, shape, and pattern of grains), Igneous rock - Formed from the cooling of magma or lava, Sedimentary rock - Formed from particles of particles of other rocks (or plants and animals)., Metamorphic rock - Formed when an existing rock is changed by heat, pressure and time (can also be due to chemical reactions).,

Classifying Rocks 5.1

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