Question

what makes solar energy green?
a. it does not require any work.
b. it is cheaper than nuclear power.
c. it does not pollute the air.
d. it does not work at night.

Explanation:

To determine what makes solar energy "green", we analyze each option:

• Option A: Solar energy systems require installation, maintenance, etc., so it's incorrect.
• Option B: Cost comparison with nuclear power isn't the defining factor of "green" energy (which relates to environmental impact), so incorrect.
• Option C: "Green" energy is environmentally friendly. Solar energy production (via photovoltaic or thermal) doesn't emit pollutants into the air, so this fits the definition of green energy.
• Option D: The fact that it doesn't work at night is a limitation, not a reason for being "green", so incorrect.

Answer:

C. It does not pollute the air.