<span> It is a north flowing river, and is on the north eastern continent of Africa.</span><span>
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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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1. Density Differentiation is responsible for the distinct layers of the Earth. Denser materials (Iron, Nickel, and other elements) sunk deeper and formed the core while less dense materials(aluminum, calcium, oxygen, silicon, etc.) formed the crust and mantle.
2. The debris which were orbiting the Earth from an impact accreted together to form the Moon.
3. Volcanic Eruptions which spewed large amounts of gasses (carbon dioxide, nitrogen, and other gasses) were attributed for the creation of the first atmosphere here on Earth. This process is also known as Volcanic Outgassing.
4. All elements which are heavier than Iron (Fe) are formed from Supernova explosions.
5. The process involved in the formation of planets and the moon from materials in the solar nebula and debris is called Accretion.