List the essential nutrient elements that plants derive mainly from the soil. Are all elements contained in plants essential nutrients? Explain. Define these terms: soil texture, soil structure, soil...

List the essential nutrient elements that plants derive mainly from the soil. Are all elements contained in plants essential nutrients? Explain.

Define these terms: soil texture, soil structure, soil pH, humus, soil profile, B horizon, soil quality, solum, and saprolite. Describe four processes that commonly lead to degradation of soil quality.