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

[EX Q]: Passage: Relative dating determines which of two fossils is older or younger than the other but not their age in years. Relative dating is based on the positions of fossils in rock layers. Lower rock layers were laid down earlier, so they are assumed to contain older fossils. This is illustrated in Figure below . Answer: relative
[EX A]: What type of dating determines which of two fossils is older or younger than the other but not their age in years?

[EX Q]: Passage: Some resources can't be renewed. At least, they can't be renewed fast enough to keep up with use. Fossil fuels are an example. It takes millions of years for them to form. We are using them up much more quickly. Elements that are used to produce nuclear power are also non-renewable resources. Uranium, for example, which is rare. Sooner or later, it will run out. Answer: nuclear
[EX A]: Uranium is an example of a non-renewable resource used to produce what type of power?

[EX Q]: Passage: A monoprotic acid is an acid that contains only one ionizable hydrogen. Hydrochloric acid and acetic acid are monoprotic acids. A polyprotic acid is an acid that contains multiple ionizable hydrogens. Most common polyprotic acids are either diprotic (such as H 2 SO 4 ) or triprotic (such as H 3 PO 4 ). Answer: monoprotic acid
[EX A]:
Which acid contains only one ionizable hydrogen?