The rocks which are formed by decayed vegetation
matter are known as:
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Answer:
The other is chemical rock, produced from the dissolution and precipitation of minerals. Detritus can be either organic or inorganic. Organic detrital rocks form when parts of plants and animals decay in the ground, leaving behind biological material that is compressed and becomes rock.
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Answer:
What role does vegetation play in rock weathering?
Okay. Let's start our discussion of the role of plants in rock weathering... First of all, keep in mind that vegetation plays a role in both physical/mechanical and chemical weathering:
Dissolution: Dissolution (a type of chemical weathering) occurs when minerals are dissolved by reactions with acids in the environment (acids such as carbonic acid in water; humic acid in soil, and man-made acids, such as sulfuric acid in rain). Vegetative bacteria which secrete acid solutions speed chemical weathering. Generally speaking, because chemical weathering is enhanced by the presence of water, the wetter (and warmer) a climate, the more chemical weathering is occurring.
Root Pry: Plants and plant roots also tend to pull rock apart (a form of mechanical weathering). Roots follow nooks and crannies along in the subsurface and, as they get older, expand. Root expansion pulls and pries apart rock.
These roots are "lifting" (breaking apart) the rock in the image above prying apart the rocks in the image to the right...
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