Ozone in the Upper Atmosphere Makes Life on Earth Possible [edit]. Ozone is a molecule composed of three oxygen atoms, (O 3). Ozone in the upper atmosphere absorbs high energy ultraviolet radiation (UV) coming from the Sun. This protects living things on Earth's surface from the Sun's most harmful rays.
In earth science, erosion is the action of exogenic processes (such as water flow or wind) which remove soil and rock from one location on the Earth's crust, then transport it to another location where it is deposited. Eroded sediment may be transported just a few millimetres, or for thousands of kilometres.
Image: a so called dolly tub, formed by the flowing water, and connected to the next dolly tub by a deep and narrow canal. Erosion is generally the process of weathering for rocks. However, this geologic term is used in speleology in a slightly different meaning, which has historic reasons. The first cave explorers saw cave rivers, which were rather similar to subsurface rivers, gorges and erosions as known before. So they interpreted the caves as a result of the erosion of underground streams.