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All of the following is true concerning freezing rain hazards EXCEPT: freezing rain

A. is difficult to discern in a car because defrosters prevent freezing that might alert a driver to the hazard. B. causes more death and damage per hour than any other storm. C. weighs trees and power lines to the breaking point. D. bounces when hitting the ground, coating the streets with a slick layer of ice.

The troposphere holds more than ________ percent of the atmospheric mass

A) 50 B) 75 C) 85 D) 90 E) 99

Human impact on desert areas is mainly due to which one of the following factors?

A. roads and highways B. introduction of alien species C. transport of water to deserts D. None of these statements correct.

Proof in science is always

A. constantly changing with little continuity between disciplines. B. Open to question or new evidence C. An impossible goal D. Firmly established E. Beyond question