| Term | Definition |
| water cycle | model of water movement and phase change |
| infiltration | water entering the upper part of the lithosphere |
| water table | interface between zone of aeration and zone of saturation |
| ground water | water below Earth's surface and below the water table |
| evaporation | phase change from liquid to gas |
| runoff | water flowing over Earth's surface |
| transpiration | water vapor from vegetation |
| permeable | material that allows liquids through it |
| sublimation | directly from gas to solid or solid to gas |
| porosity | percentage of how much space there is between particles |
| capillarity | force attracting water molecules against gravity |
| condensation | phase change from gas to liquid |
| impermeable | water is unable to infiltrate a material |