Question

7 multiple choice 2 points
what type of erosion occurs when soil and sediment are carried downhill by the force of gravity?
glacial erosion
mass movement
water erosion
wind erosion
8 multiple choice 2 points
overgrazing by livestock can lead to desertification because it:
enhances water retention in the soil
promotes tree growth
increases soil fertility
causes soil erosion
9 multiple choice 2 points
what is hazardous waste?
waste that smells bad
waste that poses a threat to human health or the environment
waste that is colorful
waste that is found in nature

Explanation:

• Question 7: Mass movement is the process where soil and sediment are carried downhill by gravity. Glacial erosion involves glaciers, water erosion is by water, and wind erosion is by wind.
• Question 8: Overgrazing removes vegetation, leaving soil exposed. This causes soil erosion which can lead to desertification. The other options are incorrect as overgrazing does not enhance water retention, promote tree growth, or increase soil fertility.
• Question 9: Hazardous waste is defined as waste that poses a threat to human health or the environment. Bad smell, colorfulness, or being found in nature are not the defining characteristics.

Answer:

1. Mass movement
2. Causes soil erosion
3. Waste that poses a threat to human health or the environment