Answer:
1.Mobile sources, natural sources, stationary sources, area sources (pili ka nalang po)
2.Riding a bike or walking instead of riding, Taking a bus or carpooling, Turning off lights and appliances when they are not in use.
3.Conserving water is important because it keeps water pure and clean while protecting the environment.Keeping our water supply safe and pure will protect the water for the generations to come.
4.Be especially careful to throw away or recycle waste properly when you are near a body of water, Be conservative with water and don't use more than you need, Use cleaning products that are safe for the environment and be careful not to use more of a product than you need for a particular cleaning job.