Which of the following do not form by deposition? beaches, deltas, moraines, mountains

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

When hydrogen peroxide (h2o2) is added to potassium iodide (ki) solution, the hydrogen peroxide decomposes into water (h2o) and oxygen (o2). the chemical equation for the decomposition reaction is: 2h2o2—> 2h2o + o2. what is the role of the potassium iodide in this reaction? a. reactant. b. product. c. precipitate. d. catalyst.

All of the following describe uses of nonrenewable energy sources except