Oceanography

How does the hydrologic cycle make the Earth habitable?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. The three states of water - - liquid, solid and gas - - are part of our planet's cycle of regeneration and growth. The hydrologic cycle is the process by which we get fresh water as rain, snow, hail and sleet. Day and night, fresh water falls onto oceans and land, where it runs off into bodies of water like rivers and lakes, or goes into the ground to become groundwater that helps our crops grow. As the sun shines, water heats up and becomes vapor. The vapor condenses into clouds that become heavy with water. Then it begins to rain again - - and the water cycle renews over and over across the planet.

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