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

Q: Ecological pyramids can demonstrate the decrease in energy, biomass or numbers within an ecosystem.

A: What can demonstrate the decrease in energy, biomass or numbers within an ecosystem?
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Q: Cloudy conditions will most likely result from a low-pressure weather system.

A: Which will most likely result from a low-pressure weather system?
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Q: Deeper layers of rock must be older than layers closer to the surface, this is the law of superposition.

A:
Deeper layers of rock must be older than layers closer to the surface, this is the law of what?
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