| A | B |
| abrasion | The grinding away of rock by other rock particles carried in water, ice or wind. |
| alluvial fan | A wide, sloping deposit of desiment formed where a stream leaves a mountain range. |
| delta | A landform made of sediment that is deposited where a river flows into an ocean or lake. |
| energy | The ability to do work or cause change. |
| flood plain | A broad, flat valley through which a river flows. |
| friction | The force that opposes the motion of one surface as it moves across another surface. |
| groundwater | Water that fills the crakcs and pores in underground soil and rock layers. |
| karst topography | A type of landscape in rainy regions where there is limestone near the surface, characterized by caverns, sinkholes, and valleys. |
| kinetic energy | The form of energy an object has because of its motion. |
| load | The amount of sediment that a river or stream carries. |
| meander | A looping curve formed in a river as it winds through its flood plain. |
| oxbow lake | The crescent-shaped, cutoff body of water that remains after a river carves a new channel. |
| potential energy | Energy that is stored and available to be used later. |
| stalactite | A calcite deposit that hangs from the roof of a cave. |
| stalagmite | A cone-shaped calcite deposit that builds up from the floor of a cave. |