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Which is visible when an area of the sun's gases are cooler than the surrounding gases?
O sunspots
solar flares
O prominences
O solar winds

its sunspots :)

Explanation:

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for my rank

answer: mercury

explanation:

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