What's the difference between a Swamp, a Marsh & a Wetland?

How are Swamps formed? What creatures live in Swamps? Where can you find the biggest Swamps in the world? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info .