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Weathering
Weathering
Weathering describes the breaking down or dissolving of rocks and minerals on the Earth's surface.
Weathering have two types; The mechanical weathering and the chemical weathering.
Mechanical Weathering
Mechanical Weathering
Physical weathering, also called mechanical weathering, is a process that causes the disintegration of rocks, mineral, and soils without chemical change.
Types of Mechanical Weathering
Types of Mechanical Weathering
Frost weathering
Insolation weathering
Unloading or Pressure release
Biological mechanical activities
Frost Weathering
Frost Weathering
Occurs in regions where temperature fluctuates above and below the freezing point, resulting in a freeze-thaw cycle.
Insolation Weathering
Insolation Weathering
Results from the expansion and contraction of rocks caused by temperature change.
Unloading or Pressure Release
Unloading or Pressure Release
occurs when the overlying rock is eroded away, causing the outer rock to expand more than the rock below it.
Biological Mechanical Activities
Biological Mechanical Activities
plant root grows into cracks in a rock, also called root wedging. When animals dig into soil or burrows, it creates holes or spaces where water can seep through.
Chemical Weathering
Chemical Weathering
Involves the interaction of rock with mineral solutions (chemicals) to change the composition of rocks. In this process, water interacts with minerals to create various chemical reactions and transform the rocks.
Types of Chemical Weathering
Types of Chemical Weathering
Oxidation
Hydrolysis
Solution/Carbonation
Weathering carbonation
Biological Chemical Activities
Oxidiation
Oxidiation
Is the reaction of rock minerals with oxygen, thus changing the mineral composition of the rock.
Hydrolysis
Hydrolysis
Takes place when acid rain reacts with rock- forming minerals such as feldspar to produce clay and salts that are removed in solution.
Solution/ Carbonation
Solution/ Carbonation
Removal of rock in solution by acidic rainwater. In particular, limestone is weathered by rain water containing dissolved CO2.
Weathering Carbonation
Weathering Carbonation
occurs when CO2 from the atmosphere slowly enter concrete over time, reacting with some of the reaction products of cement hydration and water in the pores.
Biological Chemical Activities
Biological Chemical Activities
Happens when plants releases chemicals that break down rocks.
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