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| Atmospheric moisture deposited at the earths surface as rain, hail sleet, snow etc. | Precipitation |
| The conversion of water vapour into water droplets due to cooling | Condensation |
| The conversion of water droplets into water vapour due to heating | Evaporation |
| The loss of moisture from water surfaces, soil and vegetation | Evapotranspiration |
| The horizontal movement of water through soil to reach the river | Throughflow |
| The flow of water across the surface into rivers | Overland flow / surface runoff |
| Water found under the surface in permeable rocks | Groundwater |
| Water held by plants as water falls onto leaves etc. | Interception |
| The movement of water through rocks | Groundwater Flow |
| The process of water entering rocks or soil | Infiltration |
| The downward movement of water through rocks or soil | Percolation |
| The upper surface of saturated rocks | The Water Table |
| The continuous movement of a constant amount of water between the sea, land and atmosphere | The Hydrological Cycle |
| When the ground is so full, no more water can soak through it | Saturation |