| A | B |
|---|
| Flood plain | Low, flat area that a river covers when it overflows its banks |
| Alluvial fan | Fan-shaped area of land deposited where a mountain stream moves onto flat land |
| Horn | Jagged, pyrimid shape peak formed by the intersection of three of more cirques |
| Topsoil | Top layer of soil, rich in oxygen and decayed organic matter |
| Chemical weathering | Breaking apart of rocks caused by a change in theirchemical makeup |
| Cirque | Bowl-like basin in a mountain that is carved out by an alpine glacier |
| Glacier | Thick mass of ice that covers a large area |
| Oxidation | Process in which minerals combine with oxygen to form a new substance |
| Deposition | Dropping of eroded sediment |
| Mechanical weathering | Breaking apart of rocks without changing their mineral composition |
| Moraine | Ridge of sediment deposited by a glacier |
| Mouth | Place where a river flows into a larger body of water |
| Oxbow lake | C-shaped body of water formed when a meander is cut off from the rest of the river |
| Soil | Mixture of tiny pieces of weathered rock and the remains of plants and animals |
| Subsoil | Layer of soil directly below the topsoil |
| Meander | Looping curve in a river |
| Erosion | Wearing away and moving of weatherd rock and soil |
| Delta | Fan-shaped area of land formed when sediment is deposited where a river empties into a lake or ocean |
| Weathering | Breaking down of rocks on the Earth's surface |
