All terms in this list:

Salinity: A measure of the amount of dissolved salt in water.

Altitude: Height above sea level

Humidity: The amount of water vapor in the air

Hydrogen Fusion: Green The process by which the sun produces energy by fusing together hydrogen atoms to produce helium releasing heat in the form of solar radiation.

Climate Zone: A geographic zone of the earth that is classified according to its latitude and prevailing climate.

Drainage Basin: A land area where the freshwater is drained to the ocean by a major river and its tributary streams.

Reservoir: A natural or manmade area where a large amount of something is stored or reserved.

Aqueduct: A system of manmade, canales,tunnels, and pipelines that transport freshwater into highly populated areas that do not have enough freshwater.

Greenhouse Effect: Global warming caused by a buildup of atmospheric gases such as carbon dioxide that trap solar radiation in the form of heat that is radiated back from the warmed surface of the earth.

Precipitation: Water in the form of rain, sleet,snow, or hail that falls from the atmosphere to the earth’s surface.

Atmosphere: All of the layers of gas that surround the earth.