1. Fertilizers applied to fields and crops contain nutrients that plants need, such as nitrogen, phosphorus, and potassium. What happens when rain washes those water-soluble nitrates and phosphates from fertilizers into surface waters? 2. Surface water pH is an important indicator of stream health. List three causes that can lead to acidic surface water. 3. You go out to your local stream to a location downstream of a beaver dam and notice the water is slow moving, brown, and not a lot of aquatic vegetation is present. What water quality tests might you use to determine the condition of the stream? Explain your reasons as to why you chose each test..