QUESTION 1 What percentage of our Earth's surface is covered by water? 70.6% 29.4% 33.5% 87.6% QUESTION 2 Define salinity. O the measure of the density of water the measure of the degree of saltiness of seawater the measure of the average carbon concentration in seawater QUESTION 3 In what units is ocean water salinity expressed? Omg/L ppm ppt

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