5. the earth's surface is approximately 71% water and 29% land. a. following the approach shown in class from the energy balance over land and oceans: an assessment based on direct observations and cmip5 climate models," estimate the fraction of the water vapor in the atmosphere (land +ocean) that originates from land surfaces vs oceans seas b. land surfaces receive on average 0.72 m of precipitation per year. estimate the fraction of the 0.72 m of precipitation on land that originates in the seas. can you think of any other hydrologic components that should be approximately equal to this estimate?