| A | B |
|---|
| evaporation | when the sun heats up water in rivers, lakes, or the ocean and turns it into vapor or steam |
| condensation | water vapor in the air gets cold and changes back into liquid |
| precipitation | when so much water has condensied that the air cannot hold it anymore; the clouds get heavy and water falls back to the earth |
| accumulation | when water falls back to the Earth as precipitation |
| infiltration | when water soaks into the Earth |
| ground water | water that is soaked into the Earth and used by plants and animals |
| carbon | an element that is essential to life and is found in rocks, oceans, and the atmosphere |
| ocean | the Earth's largest store of carbon |
| nitrogen | element that makes up DNA and protein and is essential to life |
| atmosphere | the largest store of nitrogen (N2) |
| rocks | where most phosphorus is stored |
