In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: The cubic crystal system is composed of how many different types of unit cells? Answer: three

A: The cubic crystal system is composed of three many different types of unit cells.
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Q: Question: What develops in depressions where water flow is low or nonexistent? Answer: bogs

A: Bogs develops in depressions where water flow is low or nonexistent.
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Q: Question: Convex lenses are thicker in the middle than at the edges so they cause rays of light to converge, or meet, at a point called what? Answer: focus

A:
Convex lenses are thicker in the middle than at the edges so they cause rays of light to converge, or meet, at a point called focus.
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