Which of these statements refers to convection?

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some of this energy is reflected off earth's atmosphere.

sunlight travels through space without the aid of fluids or solids.

warm air rises and takes the heat with it; eventually, it cools and sinks.

land and ocean absorb and re-emit heat from the sun.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

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