The process of supplying water to areas of land to make them suitable for growing crops.
The practice of using less of a resource so that it will not be used up.
The process of obtaining fresh water from salt by removing the salt.
The degree of purity of water, determined by measuring the substances in water besides water molecules.
The amount of one substance in a certain volume of another substance.
The level of the minerals calcium and magnesium in the water.
The process of passing water through a series of screens that allow the water through, but not larger solid particles.
The process by which particles in a liquid clump together.
Wastewater containing human wastes.
The addition of any substance that has a negative effect on water or the living things that depend on the water.
A substance that causes pollution.
A specific source of pollution that can be identified.
nonpoint source or non-point source
A widely spread source of pollution that is difficult to link to a specific point of origin.
A chemical intended to kill insects and other organisms that damage crops.
Rain or another form of precipitation that is more acidic than normal, caused by the release of molecules of sulfur dioxide and nitrogen oxide into the air.
A long period of scarce rainfall.
A sudden, violent flood that occurs within a few hours, or even minutes, of a storm.
A long ridge formed by deposits of sediments alongside a river channel.
The form of energy that an object has when it is moving.
Energy that is stored and waiting to be used.
Electricity produced by the kinetic energy of water moving over a waterfall or dam.