What is the main cause of air and water pollution according to the passage?

• Human energy needs and resource usage

• Natural disasters

• Animal activities

• Solar flares

What is nutrient depletion?

• The removal of important nutrients from the soil

• The addition of nutrients to the soil

• The process of soil erosion

• The process of desertification

Which of the following is NOT a way soil can be polluted?

• Unsafe farming practices

• Trash disposal

• Natural rainfall

• Mining side effects

How can farmers reduce soil erosion according to the passage?

• By plowing along the contours of the land

• By using more synthetic fertilizers

• By increasing the use of landfills

• By clearcutting forests

What is desertification?

• Turning healthy soil into land with little or no nutrients

• The process of adding nutrients to the soil

• The process of planting more trees

• The process of increasing soil moisture

Which farming practice helps restore nitrogen to the soil?

• Growing beans and peanuts

• Using synthetic fertilizers

• Clearcutting forests

• Increasing landfill areas

What is the purpose of drip irrigation in modern farming?

• To provide only as much water as crops need

• To flood the fields for better growth

• To remove excess water from the fields

• To increase the use of synthetic fertilizers