Ways of controlling soil erosion

How can trees prevent erosion?

• A. The roots hold the soil firmly together.

• B. The trees block the way of running water.

• C. The roots absorb the water at once.

• D. The roots secrete acid, attacking the rocks.

Instead of plowing up and down,farmers should plow across the slope to form ridges.

• A. Crop rotation

• B. Contour plowing

• C. Strip cropping

• D. Riprapping

1. This method of controlling soil erosion involves planting on terraces or steps built on slopes of mountainside.

• A. Riprapping

• B. Contour plowing

• C. Crop rotation

• D. Terracing

1. Chunks of stones or rocks are arranged on the edge of the slope

• A. Strip cropping

• B. Contour plowing

• C. Riprapping

• D. Crop rotation

1. Planting crops on a different spot each year.

• A. Strip cropping

• B. Riprapping

• C. Riprapping

• D. Crop rotation