Rain at Ocean Beach, San FranciscoThe oceans hold about 97% of the world’s water. Water evaporated from the oceans may be carried as water vapour across land. As it rises above high ground, it condenses and falls to the ground as rain or snow. Rivers carry the water on the land’s surface back to the ocean and the cycle begins again. Much of the water evaporated from the oceans falls directly back into the oceans. This never-ending cycle of water moving between the ocean and atmosphere is called the water cycle.