Andesite is a type of volcanic rock that is commonly found in areas with volcanic activity. It is typically gray or brown in color and has a fine-grained texture. Andesite is formed from the cooling and solidification of lava that has a moderate amount of silica, which gives it a composition between basalt and rhyolite. This rock is often associated with volcanic arcs, where tectonic plates converge. It is named after the Andes Mountains in South America, where it is frequently found. Andesite can be used in construction and is also studied by geologists to understand volcanic processes.