Aquatic ecology and Biodiversity

Unit 6- Biogeochemical cycles

6.1.2. Water cycle
The sun provides the heat energy required for the cycle to continue. The oceans and rivers are the main reservoirs of water. Water evaporates into the atmosphere. Water condenses into droplets in the clouds. As the water droplets in clouds enlarge, water falls to earth in the form of rain, snow or hail. - Water is lost through the leaves of plants ('trees perspiring').