Recent u. s. legislation has mandated increased use of biofuels resulting in the number of ethanol refineries to grow rapidly across the united states.
with this in mind, it is predicted that by 2020, as much as % of the u. s. corn crop could go toward ethanol production.

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.

What man-made lake was created by the building of the hoover dam?

Who believed that the universe was made of tiny uncuttable particles