Levees can protect many areas during floods. Why are they controversial?
In addition to being expensive, levees in many cases make problems worse, by restricting the flow of water that otherwise would have spread over a floodplain.
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Which of these factors are effective in moving heat from one location to another?
A) rain B) clouds C) ocean currents D) all of these
One June 21, the vertical rays of the Sun strike a parallel of latitude known as the ________.
equator Arctic Circle Tropic of Cancer
Which of the following is NOT TRUE regarding food resources?
A) Subsidized agriculture in the developed world negatively impacts farmers in the developing world. B) The gulf between the well fed and the hungry is vast. C) Many people in the world suffer from chronic malnutrition. D) The sharpest nutritional differences in the world are from country to country. E) Hunger among the world's poor is often attributed to deforestation, soil erosion, and other environmental impacts.
Which of the following oxygen isotopes is the most common?
A) 16O B) 17O C) 18O