The sides of a composite-cone volcano have which feature?

The sides of a composite cone volcano have FUMAROLES.
Fumaroles refers to an opening on or near a volcano through which hot gases are released into the external environment. Fumaroles are usually found on active volcanoes during periods of calm between eruptions.

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.