| A | B |
|---|
| water planet | Earth has water in solid, liquid and gas |
| global water distribution | 77% fresh water; 97% salt water |
| surface water | fresh water on earth found in lakes, rivers, streams and wetlands |
| river systems | streams and rivers forming network of water |
| watersheds | areas of land that is drained by a river |
| groundwater | water stored beneath earth surface in rock layers |
| aquifer | underground formation that contains groundwater |
| porosity | amount of airspace between rock particles |
| permeability | ability of rock or soil to allow water to flow through |
| impermeable | materials like clay or granite that stop the flow of water |
| recharge zone | where water drains from the surface to refill aquifers |
| water treatment | cleans water to make safe to drink |
| potable | safe to drink |
| pathogens | organisms that cause illness or disease |
| irrigation | providing water for plants |
| water management projects | dams and reservoirs |
| water diversion projects | supply water to dry regions |
| dams and reservoirs | contains water in case of a flood |
