Jenna Levesque ATOC 1060, March 11, 2008 Homework on Chapter 5 -- the Oceans 1) In what direction does the North Atlantic surface gyre rotate? The gyre rotates clockwise in the North Atlantic. 2) What drives this gyre to move? This is caused by the earth's rotation and the change in wind direction with latitude. 3 ) Why are the oceans salty? This is from minerals from the land being carried by rivers and streams into the ocean over millions of years. Then, water leaves via evaporation and evaporation doesn’t lift the salt with the water being evaporated, so the salt is left behind to cumulate. 4) What is the average salinity of the oceans? On average, its 35 ppt (parts per thousand) 5) How is "bottom water" formed? This extremely dense layer is found on along the ocean floor and is formed by surface water-cooling in Antarctica. It then sinks due to its high density, and then migrates north 6) How long does it take Antarctic Bottom Water to reemerge at the surfaces of the Indian Ocean and the Pacific Ocean? The water bottom masses move between 0.03km/hour to 0.06km/hour so it will
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