Answer:
1. A Volcano's are very destructive and they will cause places to be uninhabitable for days.
2. B Decreasing pollution from water will allow more aquatic life to live on and be safe to swim in the water. As well as provide food for fishers/other fish that hunt in the water without risk of sickness.
3. A Industrialization can cause air pollution and other things that can kill birds as well as decrease land value. It harms the soil/air causing animals to leave or humans to be less attracted to the area.
4. B National Parks are made to preserve wild life and nurture it. Of course this one will Increase population by providing wild life a safe place to grow and prosper. It also is pretty cool to go see nature in all its beauty!
Step-by-step explanation: