What causes the ocean's surface water to be warmer than water in the mixed zone or deep zone? a. salty water is denser than freshwater. b. icebergs melt near the ocean floor. c. the sun's rays hit the surface directly. d. upwelling pushes warm water to the surface.

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enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.