Weathering (breaking down rock) and erosion (transporting rock material) at or near the earth's surface breaks down rocks into small and smaller pieces. These smaller pieces of rock (such as sand, silt, or mud) can be deposited as sediments that, after hardening, or lithifying, become sedimentary rocks.n Earth's surface, wind and water can break rock into pieces (weathering!). They can also carry rock pieces to another place (erosion)!. Usually, the rock pieces, called sediments, drop from the wind or water to make a layer.
The water cycle or hydrologic is a continuous cycle where water evaporates, travels into the air and becomes part of a cloud, falls down to earth as precipitation, and then evaporates again. This repeats again and again in a never-ending cycle.
We learned from the water cycle that we are using and re-using the same water that has been on earth since the beginning of time. The scary part is that while the water is the same, the amount of clean water has gone down. At some point, if we do not take care of it, we will be left with only contaminated water. The water cycle is important because it ensure the availability of water for all living things. 95% of our world is water but most of it is either frozen or underground and also purifies water ready for re-use.