Primary succession is most likely caused by

Primary Succession is most likely caused by the movement of lava flow or a glacier. Primary succession is defined as the conditions which occur after an area that has previously been devoid of life and unreachable by living organisms, becomes available and an ecosystem begins to slowly develop.

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.