The most important factors in chemical weathering are water and carbon dioxide. Water- This is the most important cause of chemical weathering. The water weathers the rock by dissolving it into the water. Oxygen- This is also an important cause of chemical weathering. Do you.
This article throws light upon the five main factors which influence the rate of weathering of rocks. The factors are:- 1. Climate 2. Particle Size 3. Exposure 4. Mineral Composition 5.
This is the most important factor affecting weathering of rocks. The extent of weathering is dependent on the average atmospheric condition prevailing in a region over a long period of time. There are two factors that play in weathering, viz. Temperature and Precipitation. Warm climates affect by chemical weathering while cold climates affect by physical weathering particularly by frost action.
In either case the weathering is more pronounced with more moisture content. At higher temperatures chemical reactions are likely to take place faster. Chemical reactions in most cases need water which is a reactant in hydration and carbonation. Water is also the medium in thw the reaction can take place.
Biological activities are supported by hot moist climates. For instance burrowing humic acid production during decomposition of plant matter are most likely in hot moist climates. In fact a hot moist climate provides the most ideal environment for fast chemical weathering. Physical weathering by frost action is most likely in cold climate where freeze and thaw occur alternately during the cold weather. In this case again precipitation is the main factor. In the absence of water ice cannot form and frost action is not possible.
Weatthering an effective frost action occurs in the cold moist climate. Rate of chemical weathering is affected by size of rock particles.
If the rock pieces are smaller, the weathering is faster. This is because if the rock pieces are smaller, the surface area exposed to weather action is greater. The extent of exposure i. In some situations, vegetation, soil, ice, etc. Such rocks so protected weather slowly compared to rocks whose surfaces are wholly exposed to weather. Slope of the region is also a factor affecting weathering. Where the slopes are steep, loose materials are displaced downhill either by gravity or by erosion resulting in continuous exposure of the fresh rock.
We know, the chemical properties of a rock depend omportant the mineral composition to a great extent. Mineral in a rock may readily thf with acids, water or oxygen causing considerable weathering. For example limestone can what is an undefinitized contract action severely acted upon by even very mildly acidic rainwater.
Granite on the contrary mostly containing silica remains unaffected by such agents. Physical weathering is also dependent on mineral composition. Rocks which are soft are liable to be abraded more readily than hard rocks. The solid crystalline rocks are quite compact with very little opening and are very resistive to entry of water into them, and can therefore resist weathering.
The process of weathering is a time taking process. The duration of time for which a rock is exposed to weather determines the extent of weathering.
Very strong rocks, however strong they might be will severely undergo weathering in hundreds of years. Weathering of Rocks: Physical and Chemical Geology. Weathering of Rocks Factord.
1. Physical weathering:
Dec 14, · The most important factors of chemical weathering is "Carbon Dioxide" and "Water". Hope this helps! florianmanteyw and 15 more users found this answer helpful. heart outlined. Factors that affect the rate of weathering 1. CLIMATE: The amount of water in the air and the temperature of an area are both part of an area’s climate. Moisture speeds up chemical weathering. Weathering occurs fastest in hot, wet climates. It occurs very slowly in hot and dry climates. Without temperature changes, ice wedging cannot occur. In. Chemical Weathering may occur due to the following processes and reactions. Dissolution and Carbonation; Hydration; Hydrolysis; Oxidation; In Chemical Weathering the broken particles have different composition from the parent material and change into different substances. 1) Dissolution and Carbonation. In unpolluted environments, the rainfall pH is around
The breakdown and alteration of rocks and minerals is known as weathering. Weathering is the first step in other geomorphic and biogeochemical processes. Weathering also contributes to a major source of sediments for erosion and deposition. In addition, weathering contributes to the formation of soil because it provides mineral particles like sand, silt, and clay. Weathering can result in the complete loss of particular atoms or compounds from the weathered surface.
Weathering can lead to the addition of specific atoms or compounds to the weathered surface. Weathering of rocks and minerals can breakdown one mass into two or more masses with no chemical change in the mineral or rock.
Physical or mechanical weathering is the breakdown of a substance by disintegration. Frost wedging occurs when there is an alternation between freezing and thawing of moisture in the openings or cracks or rock which results in the breakdown of the rock. Unloading or exfoliation is the erosion of upper rock portions which cause underlying rocks to expand resulting in cracking and peeling. Organic activity is the activity of plant and burrowing animals that can cause a rock material to disintegrate.
Chemical weathering is the breakdown of a substance by decomposition, thus resulting in a formation of new mineral matter. Chemical processing can result from a number of different processes. The kinds of chemical processing include:. The chemical weathering process is most affected by the climate, because climatic conditions control the rate of weathering.
One factor that affects weathering is the total surface area of mineral or rock; the processes of weathering increases proportionately with the amount of open space at the surface of the rock and extend through the rock. Climate is another factor that affects the weathering process. Composition of rock or mineral substance can also affect the process of weathering.
The final element that affects weathering is time. Versiera Miller began writing in , bringing expertise in financial topics. She holds a M. What Are the Properties of Metamorphic Rocks?
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Definition of Weathering of Rocks. Copyright Leaf Group Ltd.