instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: The energy in sunlight, or solar energy, can be used to heat homes. It can also be used to produce electricity in solar cells. However, solar energy may not be practical in areas that are often cloudy. Answer: solar energy
answer:
The energy in sunlight is also known as what kind of energy?

question:
Passage: An ionic bond is the force of attraction that holds together oppositely charged ions. Ionic bonds form crystals instead of molecules. Table salt contains ionic bonds. Answer: ionic bond
answer:
What term means the force of attraction that holds together oppositely charged ions?

question:
Passage: Look at the Figure below of water (H 2 O) and hydrogen peroxide (H 2 O 2 ), and read about these two compounds. Both compounds consist of hydrogen and oxygen, but they have different ratios of the two elements. As a result, water and hydrogen peroxide are different compounds with different properties. If you've ever used hydrogen peroxide to disinfect a cut, then you know that it is very different from water!. Answer: hydrogen and oxygen
answer:
What elements do water and hydrogen peroxide consist of?