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Rocks can form soil from water,micro organisms,air,oxygen,carbon dioxide,sun example the sun makes the rocks bigger and the oxygen makes the cracked on the rocks and when the water goes inside the rocks the other part of the rocks flows with the water and the rocks becames a powder so it became a soil so thats how the rocks became soil
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soil is the loose umaggregated and uncemented form of sediment grains, an aggregate of minerals that can be seperated by applying mechanical stress whereas a rock (also being an aggregate of minerals) has strong cohesive forces that keep it intact. 
Soil is fromed from the physical disintegration and chemical decomposition of a rock, with time these sediments are consolidated and they form the soil cover. 
A rock is formed basically by three processes:- 
Cooling of lava or magma (igneous rocks) 
Change in Pressure temperature and compositional setting of pre-existing rocks (metamorphic rocks) 
Compaction and consolidation of sediments that have eroded from pre-existing rocks that can be igneous or metamorphic (sedimentary rocks)
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