(Q).
Answer the following question given this paragraph: Lightning is the discharge of static electricity that has built up on clouds. Every year, the earth experiences an average of 25 million lightning strikes. Lightning bolts travel at speeds up to 60,000 miles per second, and can reach temperatures of 50,000F, which is five times the temperature of the surface of the sun. The energy contained in a single lightning strike could light a 100 Watt light bulb 24 hours per day for 90 days. Q: Where do lightnings build up? Choices: - stratosphere - air - troposphere - clouds A:
(A).
clouds

(Q).
Answer the following question given this paragraph: It's much easier to precisely make mirrors than to precisely make glass lenses. For that reason, reflectors can be made larger than refractors. Larger telescopes can collect more light. This means that they can study dimmer or more distant objects. The largest optical telescopes in the world today are reflectors. Telescopes can also be made to use both lenses and mirrors. Q: What happens to old oceanic crust at convergent boundaries? Choices: - created - dissolves - emerges - destroyed A:
(A).
destroyed

(Q).
Answer the following question given this paragraph: Scientists are searching for ways to create controlled nuclear fusion reactions on Earth. Their goal is develop nuclear fusion power plants, where the energy from fusion of hydrogen nuclei can be converted to electricity. You can see how this might work in the Figure below . In the thermonuclear reactor, radiation from fusion is used to heat water and produce steam. The steam can then be used to turn a turbine and generate electricity. Q: What drives the turbine in a thermonuclear reactor? Choices: - magnets - heated oil - wind energy - heated water or steam A:
(A).
heated water or steam