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freshwater the water most important to humans coniferous evergreen trees with cones and needles Tropics climate region at low latitudes acid rain chemicals in air pollution combined with precipitation salt water the water in the earth's oceans groundwater peoples' largest source of freshwater permafrost layers of soil that remain frozen year-round deserts the earth's driest areas monsoons seasonal winds that bring rain to South Asia tundra vast treeless plains that have a cold climate