The two major sources of chemically unreacted rocks are igneous rocks and metamorphic rocks. Igneous rocks form from the cooling and solidification of magma or lava, while metamorphic rocks are formed by the alteration of pre-existing rocks through heat and pressure without melting.
Water is the major agent of chemical weathering because it can dissolve minerals in rocks, facilitating chemical reactions that break down the rocks over time. Water also provides a medium for reactions to occur and helps transport dissolved minerals away from the weathering site. The abundance and properties of water make it highly effective in altering and breaking down rocks chemically.
Lichens are plant-like organisms that grow on rocks and produce weak acids that chemically weather rocks. They are a symbiotic relationship between algae or cyanobacteria and fungi, and their ability to break down rocks contributes to soil formation over time.
The major reservoir of the phosphorus cycle is in rocks and sediments. Phosphorus is released into the environment through weathering of rocks, where it can then be taken up by plants and other organisms.
Sources of phosphates include fertilizers, detergents, wastewater from households and industrial activities, and agricultural runoff. Phosphates can also be naturally occurring in rocks and minerals.
placer deposits
Sedimentary rocks can be both chemically and mechanically weathered.
Rainwater.
Mechanically
Chemically formed sedimentary rocks are formed from dissolved minerals that precipitate out of water through processes like evaporation or chemical reactions. Examples include rocks like limestone, rock salt, and gypsum.
No atmosphere-no weather.
Natural acids chemically weather rocks by reacting with minerals in the rock, causing them to break down. Mechanical weathering involves physical processes like freezing and thawing, which cause rocks to break apart without altering their chemical composition.
Biologically, Chemically and Mechanically.
erosion
All sorts as all rocks have their own textures and are all formed from chemical compounds, but the primarily chemically-formed ones are the igneous rocks and associated minerals.
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Human pollution is generally acidic. Sometimes, the pollution can contaminate rainclouds or other sources of water, forming an acidic liquid. If a rock has contact with this substance, it could be eroded chemically.