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Chris Marone

1) The residence time of an element in seawater is an indication of how rapidly it is cycled. Long residence times indicate low demand and/or infrequent precipitation as a mineral. T/F Residence time is inversely related to extent of involvement in chemical reactions in the ocean 2) Gases dissolve more readily in cold seawater than in warm seawater. a) T or b) F 3) The ocean is a) well mixed and has the same temperature at all depths b) stratified into layers, such that shallow water has different properties than deep water. c) well mixed and has the same density at all depths d) (a) and (c) e) none of the above 4) Marine animals break down water molecules to obtain O2 T/F 5) The density of seawater a) decreases as it cools from 30 deg C to 5 deg C. b) increases as salinity decreases from 35 to 33 ppt. c) is minimum at 4 deg C, independent of salinity. d) increases as temperature falls and salinity rises. 6) The density of liquid water is higher than that of ice which is why ice floats: T/F 7) Sigma_t is a measure of a) salinity. b) density. c) temperature. 8) The ocean is stratified (layered) with the densest water on top and less dense water below. T/F 9) Which of the following is/are true about residence time for an element in seawater. A. It can be calculated from the total amount of the element present in coral reefs. B. It can be calculated from the amount in Earth's interior. C. It is given by the ratio of the
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