Top soil is known as the A horizon, therefore, it is the very top layer
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Topsoil is the uppermost layer of soil, usually the top 2 to 8 inches, where most of the soil's organic matter and nutrients are found. It is crucial for plant growth and plays a significant role in supporting plant life.
Yes, "topsoil" is one word.
Topsoil.
The weight of topsoil varies, but on average, 1 liter of topsoil weighs about 1.2-1.4 kilograms. So, if you have A liters of topsoil, you can estimate the weight by multiplying A by the average weight per liter.
Farmers often till the topsoil to help improve crop growth.
Topsoil loss is considered a worldwide problem because topsoil is crucial for agriculture and food production. It takes centuries to form a few centimeters of topsoil, and erosion rates are much higher than the rate of topsoil formation. Without fertile topsoil, it becomes difficult to grow crops and sustainably support the growing global population.