Suppose that this reaction needs a catalyst to proceed. in the absence of a catalyst, the activation energy would be

A catalyst lowers activation energy by providing an alternative pathway. So without the catalyst the activation energy will be higher which means that the reactants will require more energy in order to react. Hope this help :)

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.

It should be cryosphere and hydrosphere