Earth science assumes that the causes of natural phenomena A. can never be fully understood
B. can be understood by studying supernatural phenomena.
C. can be understood by studying ancient Greek culture
D. can be understood through careful observation.

Ais the correct answer

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.

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