Elden grows wheat on his land. However, his wheat farm is on a steep slope and hence more prone to soil erosion. In order to prevent soil erosion, he rotates wheat with soybean. What type of soil conversion method did Elden use?

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire