Living in the Environment 18th Edition by Tyler Miller,Scott Spoolman

تمرين 18

What is the key concept for this section List two major benefits of high-yield modern agriculture. Define soil and describe its formation and the major layers in mature soils. What is topsoil and why is it one of our most important resources What is soil erosion and what are its two major harmful environmental effects What is desertification and what are its harmful environmental effects Define soil salinization and waterlogging and describe their harmful environmental effects. What is the biggest problem resulting from excessive use of water for irrigation in agriculture