FINAL QUESTIONS
What happens to land during desertification, and what human activity can cause it?
Land becomes dry and infertile; caused by deforestation, overgrazing, or poor farming.
What is reforestation, and why is it important for the environment?
Planting trees again; helps prevent erosion and improves air quality.
What is land reclamation, and give one example of how it is done.
Restoring damaged land; cleaning polluted land or planting vegetation.
What is point-source pollution, and give one example.
Pollution from one clear source; factory pipe or sewage outlet.
What is nonpoint-source pollution, and why is it hard to control?
Pollution from many sources; comes from farms, roads, and cities and is spread by rain.