| Term | Definition |
| Soil Run-off | the soil, sand, mud etc. that comes off when it rains is called |
| Sedimentation | when sediment has been washed away then settles somewhere new is |
| Ground Water | water that has seeped through pores in the ground and collects on the non-porous rock bed is |
| Sediment Testing | putting a secchi disc into a water sample until it cannot be seen is |
| Debris | particles of rock silt and sand are |
| Grazing | farm and wild animals eating plants that hold soil together is |
| Clear-cutting | the process of removing all trees from an area is called |
| Erosion | sediment moving from one place to another is |