Final answer:
The classic approach identifies improper farming methods, population pressure, land tenure, and social inequality as the four major problems in relation to soil erosion.
Step-by-step explanation:
The four major problems that the classic approach identifies in relation to soil erosion, according to Blaikie, are improper farming methods, population pressure, land tenure, and social inequality. Improper farming methods can contribute to soil erosion through practices such as overgrazing, overuse of pesticides, and excessive tilling. Population pressure refers to the increasing demand for food and resources due to a growing population, which puts strain on land and can lead to soil erosion. Land tenure issues, such as land ownership and management, can affect the way land is used and maintained, leading to soil erosion. Lastly, social inequality can play a role in soil erosion, as marginalized groups may not have access to resources or knowledge needed to address soil erosion effectively.