Why is ice less dense than water?
A. As water freezes, it forms cubic crystals made only of eight atoms. These atoms weigh less in ice than in water.
B. Water molecules lose one of their hydrogen atoms when they form ice, making the solid form less dense than the liquid form.
C. When water freezes, the molecules arrange into a crystal form in which they are farther apart than in liquid water.
D. As a solid, ice is actually more dense than water, but will still float due to the high surface tension of water.
Answer: C
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a. Sand has sharp, jagged edges. b. Capillary forces can pin organisms down within the sand. c. Organisms have a hard time finding a firm footing when burrowing. d. All of these choices
With the Air Pollution Control Act and the Clean Air Act's subsequent amendments over the past few decades, air quality in the U.S. with regard to criteria pollutants has
A) worsened, with all pollutants significantly increasing. B) remained about the same for all pollutants. C) significantly improved for all pollutants except lead, which has worsened. D) greatly improved for all pollutants.
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A. settled North America B. went from being hunter-gatherers to farmers C. left Africa D. began to walk upright E. invented gunpowder
The descriptions and models that geographers apply to cities in the United States are equally valid for cities around the world.
Answer the following statement true (T) or false (F)