Weathering is the event of the destruction of rock into smaller pieces even soluble in water. Weathering is divided into three kinds, namely:
a. Weathering the physical (mechanical), is weathering that does not result in changes in the chemical composition of rocks came from. Physical weathering caused by the following:
1. large temperature differences during day and night like a rock in the desert cause broken or cracked
2. frozen ground water or rock pores. Frozen water causes the volume to increase. These developments led to rocks being broken
3. mengkristalnya salt water. If the soil contains salt water, the water evaporates during the day and its salts crystallize. Salt crystals is very sharp and can damage the rock
4. movement of water flow. Moving water can cause a sharp and large rocks being broken and destroyed.
b. Khemis weathering (chemical), is weathering that causes changes in the chemical composition of rocks. Many chemical weathering occur in areas of limestone (karst) with the help of water and carbon. Limestone (CaCo3) when in contact with water (H2O) and carbon dioxide (CO2), will change to calcite. Formation due to chemical weathering in limestone areas will result in:
1. dolina, holes through the funnel-shaped due to the leaching process
2. stalactites and stalagmites in limestone caves
3. caves and underground rivers.
c. Weathering of organic (biological), is weathering caused by organisms such as animals and plants. Weathering by animals such as ants, earthworms, insects, and so on. Weathering by plants such as the roots of plants or the leaves and twigs of the plant and may rot into acid rock melapukkan.
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