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The climate get warmer.

Explanation:

Volcanoes can impact climate change during major explosives eruptions huge amounts of volcanic gases,aerosel droplets and ash are injected into the stratosphere. But volcanic gases like sulfur dioxide can cause global cooling while volcanic carbon dioxide, a greenhouse gas has the potential to promote global warming.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >