SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sand, silt, and loam
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Gravel, sand, and silt
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Topsoil, humus, and parent material
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Topsoil, subsoil, and parent material
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Detailed explanation-1: -The main layers of the soil are topsoil, subsoil and the parent rock . Each layer has its own characteristics. These features of the layer of soil play a very important role in determining the use of the soil. Soil that has developed three layers, is mature soil.
Detailed explanation-2: -A soil usually has three major horizons: (1) the topsoil or “A” horizon, (2) the subsoil or “B” horizon, and (3) the parent material or “C” horizon (Figure 1).
Detailed explanation-3: -Parent material is the geologic material from which soil horizons form. There are seven variations of parent material. Weathered Bedrock, Till, Outwash Deposit, Eolian Sand, Loess, Alluvium, and Local Overwash.
Detailed explanation-4: -The topsoil, subsoil and parent material.