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Preview questions
1. What is the top layer of soil called?
Subsoil · Topsoil · Bedrock · Clay
2. Which component of soil is essential for plant growth?
Sand · Silt · Clay · Humus
3. What is the process of soil formation called?
Erosion · Weathering · Sedimentation · Decomposition
4. Which type of soil retains the most moisture?
Sandy soil · Clayey soil · Loamy soil · Silty soil
5. What is the main reason for soil erosion?
Overgrazing · Deforestation · Water runoff · All of the above
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