| A | B |
|---|
| point source pollution | pollution that enters water from a specific location, such as drainpipes or ditches |
| nonpoint source pollution | polution that enters water from a large area, such as lawns, construction sites, or roads |
| sediment | loose material, such as rock fragments and minneral grains, that is moved by erosion. It is the largest source of water pollution in the US. |
| pesticides | substances that destroy or kill pests. They are used by farmers and home owners to keep insects and weeds out of their crops and lawns |
| fertilizers | chemicals that help plants grow |
| sewage | water that goes into drains that contains human waste, detergents and soap |
| groundwater | water that soaks into the ground and collects in pores and emty spaces and is an important source of drinking water |
| water table | upper surface of the zone of saturation; goes down or drops during a drought |
| permeable | describes soil and rock that allow water to pass through |
| impermeable | describes rock or material that does not allow water to flow through |
| aquifer | layer of permeable rock that allows water to flow through |
