Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: Refracting and reflecting telescopes are optical telescopes that use lenses to gather light. Answer: light
[A]: Refracting and reflecting telescopes are optical telescopes that use lenses to gather what?

[Q]: Passage: Renewable resources are natural resources that can be replaced in a relatively short period of time or are virtually limitless in supply. Renewable energy resources include sunlight, moving water, wind, biomass, and geothermal energy. Each of these energy resources is described in Table below . Resources such as sunlight and wind are limitless in supply, so they will never run out. Besides their availability, renewable energy resources also have the advantage of producing little if any pollution and not contributing to global warming. The technology needed to gather energy from renewable resources is currently expensive to install, but most of the resources themselves are free for the taking. Answer: renewable resources
[A]: What are natural resources which can be replaced in a relatively short period called?

[Q]: Passage: A chemical change occurs whenever matter changes into an entirely different substance with different chemical properties. Burning is an example of a chemical change. Answer: chemical change
[A]:
What kind of change occurs whenever matter changes into an entirely different substance with different chemical properties?