Why are over one-sixth of the world's people at risk for running out of drinking water? (a) the oceans are drying up. (b) there is not enough surface water. (c) the world's fresh water wells are drying up. (d) glaciers in many areas are melting.

What evidence supports geological processes changing the surface of the earth? cutting down forests creates a decrease of habitats. tectonic plates uplift the rocky crust of earth to form mountains. competition in ecosystems creates a decrease in diversity. pollution runoff contaminates a lake.