Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Water, air, and milk list includes only examples of matter that can take the shape of a container.

A: Which list includes only examples of matter that can take the shape of a container?
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Q: The newest, outer layers of secondary xylem are called sapwood.

A: What are the newest, outer layers of secondary xylem called?
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Q: Volcanoes kind of mountainous formation can often be found near trenches.

A:
What kind of mountainous formation can often be found near trenches?
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