1. The problem statement, all variables and given/known data Earth’s radius is 6370 km and approximately 70% of its surface is covered with water, to an average depth of 12,000 feet. Calculate the approximate volume, in km 3 , m 3 , cubic miles and gallons of Earth’s oceans. 2. Relevant equations 3. The attempt at a solution I was told to find the area and to multiply by the avrg depth but i am still confused.