As I get deeper and deeper into the 'logistics' of making maps... I've come up with some general questions that I'm hoping someone can answer. These aren't about any particular software questions, more like atmospheric/geological questions, that will help me make better maps... so here it goes!

What is the difference between a marsh and a swamp? What atmospheric/geologic conditions would create one vs the other? Would it be feasible to come out of say a mountain range or forest and find oneself in either a marsh or a swamp? Are they more prevalent in northern regions or southern regions? Why do they form?