Answer to Question 1
Point source is water pollution that is from a specific place. For example, a factory that dumps waste in a river is a point source. Nonpoint means that pollution does not come from a single point but from a wide area and is difficult to identify.
Answer to Question 2
In a cycle known as the hydrological or water cycle, water is constantly cycled through the process of evaporation, condensation, and precipitation. Precipitation from rainfall or through melting snow eventually winds up in storage. Storage takes place in surface water and groundwater. Water collects in surface storage and streams that empty into lakes or oceans. Groundwater is under the surface of the ground and makes up the water table that supplies wells. This water is stored in rock, sand, or gravel formations.
Water striders serve as a model organism for the study of sexual conflict between males and females.
Water bridge
A cutaway of a typical water pump showing the long bearing assembly and the seal. The weep hole is ...
5-4 The relationship between vapor pressure and temperature—in this case for water. As the ...
Water-Soluble Vitamins Act as Coenzymes in Metabolic Processes
Two Zebras Drinking Water