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well you can find out by going to the science section! but here you go The answer is actually dependent upon what the parent material of the topsoil is, and the climate conditions. If the soil is being formed in a damp forest with plenty of organic material from decomposing leaf litter, soil can be formed quicker then if the soil is being formed from an eroding mountain/boulder. In all conditions though soil building is generally slow, which is why emphasis is placed on limiting soil erosion during activities that would disturb the soil such as construction, farming etc...
What do you mean by parent material?
never mind use the science section!
there is no sicence section
just explain what parent material is plz
Topsoil can take a long or short time to form.  Over the long term, it's formed by weathering of the Earth's surface. That puts minerals into soil.  Over the long and short term, it's formed by the contributions of air and water. Both also put nutrients into soil. Healthy soil needs 16-17 nutrients. One is nitrogen, which is our most common element. Rain and snow fall and other nutrients [or toxins if the air's polluted] let it infiltrate into and percolate through soil.  Over the long and short term, it's also formed by living things. Animals and plants, and their byproducts add organic matter to soil. They also give soil healthy structure. Healthy structure is characterized by solid content, and by access to solid content through passageways. For example, earthworms and microarthropods open up air and water pore spaces. Or, as another example, insects and plants in and on soil die and decompose. Their decomposition puts nutrients such as carbon into soil. Or, as still another example, nitrogen-fxing bacteria and nematodes make nitrogen available to plants in the necessary soluble form. In turn, they become the food of bacteria-feeding and predatory nematodes. What's inside their bodies passes through their predators' bodies, and back into soil. Or, as yet another example, plant roots put carbohydrates ka exudates into soil. They open up air and water pore spaces. And they give all their nutrients back to soil when they decompose.  Anyone can help in the formation of topsoil. What's needed is air, life above and below ground, minerals, and water. Mixing compost into soil aerates at the same time that it adds organic matter. Mulching adds to soil fertility and health by breaking down over time, and thereby feeding nutrients into soi.
dont copy ad paste -_-
well do you own work then!she is just getting information for you and then you can put it in your own words -.-