Why does more water evaporate off of oceans than off of land?

Evaporation is bigger above the oceans than above the earth, while precipitation is higher over the earth than over the ocean.

Explanation:

Most of the water that evaporates from the ocean goes back to it. However, a small percent of the water that evaporated from the ocean goes as precipitation to earth. This process of evaporation is very large so that without precipitations, evaporation and underground water, oceans would be nearly empty.