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

Q: Energy do ecosystems absorb on the earth.

A: What do ecosystems absorb on the earth?
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Q: The combustion of propane gas produces carbon dioxide and water vapor.

A: The combustion of propane gas produces carbon dioxide and what else?
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Q: Compounds with aluminum and silicon are commonly found in the clay fractions of soils derived from volcanic ash.

A:
Compounds with aluminum and silicon are commonly found in the clay fractions of soils derived from what?
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