Which of the following are the two primary types of soil erosion?

• A. Thermal erosion and chemical erosion
• B. Wind erosion and water erosion
• C. Biological erosion and mechanical erosion
• D. Erosion by gravity and tectonic erosion

Answer: (B)

The two primary types of soil erosion are wind erosion and water erosion. Wind erosion occurs when strong winds blow across loose, dry, and bare soil, detaching and lifting soil particles into the air. This type of erosion is particularly common in arid and semi-arid regions, where vegetation is sparse and the soil is dry.

Water erosion, on the other hand, is the removal of soil by water. This can occur through rainfall that directly dislodges soil particles or through surface runoff, which can transport soil away from its original location. Water erosion is responsible for most erosion-related soil loss globally, significantly impacting agricultural productivity and natural ecosystems.

Other types of erosion mentioned in the other options, such as thermal erosion and chemical erosion, do not classify as primary types of soil erosion. Thermal and chemical processes can contribute to soil degradation but are generally not categorized in the same way that wind and water are.