Answer:
Land Pollution
Explanation:
Land pollution refers to the deterioration of the earth's land surfaces, at and below ground level. The cause is the accumulation of solid and liquid waste materials that contaminate groundwater and soil. ... By utilizing the natural shale and clay in the land, the risk of land pollution has been significantly decreased
The correct statement is that "There is a thin layer of topsoil in tropical rainforests."
This is because the tropical rainforest is characterized by constant rainfall. This leads to eating away of the topsoil in the tropical rainforest, thereby making it thin in texture and content.
Option A is not correct because temperate areas have thickly layered topsoil.
Options B and C are wrong because desserts have sandy soil, which is not humus in anyways.
Hence, in this case, the correct answer is option D. "There is a thin layer of topsoil in tropical rain forests."
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