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.
Understanding how the water cycle operates is key to understanding how rivers work. The water cycle is also known as the hydrological cycle [hydrological cycle: The continual movement of water between the rivers, oceans, atmosphere and land.] .It is called a cycle because water continuously moves around the system.Rivers are part of this cycle.he water cycle is also known as the hydrological cycle [hydrological cycle: The continual movement of water between the rivers, oceans, atmosphere and land.] .