One problem that arises with monitoring freshwater supplies is that it can take years to detect pollution in underground water. there is no federal regulation of groundwater. the world is mostly covered with water. most freshwater supplies are found on the surface of earth.

The term “iron curtain” was based on an actual iron curtain that german theaters used to separate the stage from the audience in case of a fire. who or what did the “iron curtain” of the cold war separate? democratic nations from communist nations the soviet union from its allies the united states from europe europe from asia