 Weather ring, weather ring is the breaking down of rocks, soil and minerals as well as wood and artificial materials through contact with the earth's atmosphere, water and biological organisms. Weathering occurs in situ on site that is in the same place with little or no movement and thus should not be confused with erosion, which involves the movement of rocks and minerals by agents such as water, ice, snow, wind, waves and gravity and then being transported and deposited. In other locations, two important classifications of where the ring processes exist, physical and chemical weather ring, each sometimes involves the biological component. Mechanical or physical weather ring involves the breakdown of rocks and soils through direct contact with atmospheric conditions, such as heat, water, ice and pressure. The second classification, chemical weather ring, involves the direct effect of atmospheric chemicals or biologically produced chemicals also known as biological weather ring in the breakdown of rocks, soils and minerals. While physical weather ring is accentuated in very cold or very dry environments, chemical reactions are most intense where the climate is wet and hot. However, both types of weather ring occur together and each tends to accelerate the other. For example, physical aberration rubbing together decreases the size of particles and therefore increases their surface area, making them more susceptible to chemical reactions. The various agents act in concern to convert primary minerals fell sparse and mycas to secondary minerals, clays and carbonates and release plant nutrient elements in soluble forms. The materials left over after the rock breaks down combined with organic material creates soil. The mineral content of the soil is determined by the parent material, thus, the soil derived from a single rock type can often be deficient in one or more minerals needed for good fertility, while a soil weathered from a mix of rock types as in glacial, geolion or alluvial. Sediments often makes more fertile soil. In addition, many of Earth's landforms and landscapes are the result of where the ring processes combined with erosion and redeposition.