| A | B |
|---|
| the sun | energy driving the water cycle |
| percolation | water seeping down through pores in rocks |
| wind, water, gravity and ice | four agents of erosion |
| drainage basin | another name for a watershed |
| watershed | area of land drained by a river |
| load | materials, other than water, carried by a river |
| discharge | the water carried by a river |
| gradient | slope or steepness of the land |
| tributary | smaller river or stream that empties into a larger river |
| young | the type of river that has deep water that flows quickly |
| rejuvenated | the type of river that is reborn from an older one |
| deposition | materials that can no longer be carried by the river are dropped |
| alluvial fan | triangular deposit at the base of a hill or cliff |
| delta | triangular deposit at the mouth of a river |
| floodplain | area of land covered by water when a river overflows |
| water table | the highest point the water reaches underground |
| permeable rock | the type of material that water can move through |
| impermeable rock | the material beneath the ground water that stops its downward flow |
| recharge zone | the area where the aquifer is able to be refilled |
| lake or spring | an area where the water table is exposed |
| stalactites | structures made mostly of calcium carbonate that hang from the cave's ceiling |
| stalagmites | structures made mostly of calcium carbonate that rise up from the cave's floor |
| three | the percent of the Earth's water that is drinkable |
| nitrates | too much of this chemical is harmful in our water supply |
| conserve | what we should do to protect our water supplies |
