Which of the following conditions are necessary for falling snowflakes to survive in air with temperatures much above freezing?
A. unsaturated air and wet-bulb temperature above freezing
B. unsaturated air and wet-bulb temperature at or below freezing
C. saturated air and wet-bulb temperature above freezing
D. saturated air and wet-bulb temperature at or below freezing
Answer: B
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Which of the following would be least readily recycled?
A. copper pipes B. lead from car batteries C. aluminum beverage cans D. chromium from stainless steel fixtures
The only substance that can exist as a gas, liquid, and solid at common Earth temperatures is
A) carbon. B) nitrogen. C) water. D) oxygen.
Biodiversity is important because
A) it is necessary to maintain stability of ecosystems. B) humans can use new sources of food. C) if certain species decline, photosynthesis may not be possible. D) if certain species decline, there would be too much oxygen in the atmosphere.
The first scientist to be credited for discovering the concept of inertia was
A. Aristotle. B. Galileo. C. Copernicus. D. Newton.