Explain how seawater salinity is affected by surface processes (such as precipitation and evaporation, for example)
What will be an ideal response?
Surface water salinity is high when there is high evaporation and little to no precipitation and runoff. Surface water salinity is low when there is abundant precipitation and runoff and the melting of freshwater icebergs. In addition, cool temperatures limit the amount of evaporation that takes place.
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Why are plate boundaries the sites of most geologic activity?
A. Plates interact with one another at their boundaries. B. Plate boundaries are zones of weak crustal material. C. Plate boundaries are not sites of most geologic activity. D. Heat from Earth's core escapes between tectonic plates.
Greenhouse gases
A. warm the earth's lower atmosphere. B. are vital human nutrients. C. block all ultraviolet radiation from reaching the earth's surface. D. cause the earth's rotation on its axis. E. create rain.
Because of gas that is trapped between the double glass surface of drinking ware
A. conductivity is lessened. B. insulation is increased. C. both of these D. none of the above
Which of the following represents the most recent time that thick sheets of ice advanced over North America as far south as New York?
A. 18,000 to 22,000 years ago B. 45,000 to 50,000 years ago C. 250,000 to 500,000 years ago D. 2 million years ago, at the beginning of the Pleistocene epoch