How does a pond form? a. a mudflow blocks a river. b. water collects in a low-lying area. c. humans use a dam to create a reservoir. d. a depression made by an ice sheet fills with water.

The right option is; B. Water collects in a low-lying area.

A pond is an inland body of standing water, either man-made or natural, that is smaller than a lake. A pond forms when water collects and fills in a low-lying area (depression) in the ground. Wetland animals and plants can be found in ponds. As the plants inside and around a pond grows, after some time they die and decay. This cause layers of soil in the pond to accumulate which in turn makes the pond to become shallower.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

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