As water slows down, it deposits sediment and gradually builds a fan. See alluvial fan . Sudden movements on faults cause earthquakes . . Potassium feldspars contain considerable potassium. Plagioclase feldspars contain considerable sodium and calcium.
Feldspar crystals are stubby prisms, generally white, gray, or pink. .
Microscopic tunnels made in crystals by escaping nuclear particles emitted by radioactive elements. Most commonly studied are fission tracks in zircon crystals made by the radioactive decay of uranium, present as an impurity. A lake, stream, or other body of water that flows over its natural confining boundaries. During a flood, water flows out over land not normally covered with water. During floods, when the stream overflows its banks, water flows over the flood plain.