| A | B |
|---|
| erosion | worn away by the action of water and wind |
| percolation | slow passage of a liquid through a filtering medium |
| transpiration | emission of water vapor from the leaves of plants |
| tributary | A branch that flows into the main stream |
| watershed | area drained by a river and its tributaries |
| divide | boundary between drainage areas that have streams which flow in opposite directions |
| channel | A deep and relatively narrow body of water |
| load | materials carried by a stream |
| sediment | Matter that has been deposited by some natural process |
| deposition | natural process of laying down a deposit of something |
| delta | low triangular area of alluvial deposits where a river divides before entering a larger body of water |
| floodplain | low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding |
| levee | An embankment that is built in order to prevent a river from overflowing |
| aquifer | Underground bed or layer yielding ground water for wells and springs |
| porosity | percentage of the total volume of a rock or sediment that consists of open space |
| permeability | property of something that can be penetrated by a liquid |
| water_table | upper surface of underground water; upper boundary of the zone of saturation |
| recharge_zone | area in which water travels downward to become part of an aquifer |
| artesian_spring | rising to the surface under internal hydrostatic pressure |
| sinkhole | formed by solution or by collapse of a cavern roof |
