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

Q: When gas particles heat up, pressure increase.

A: Does pressure increase or decrease when gas particles heat up?
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Q: When the energy of the earthquake reaches shore, it forms a huge wave called a tsunami.

A: When the energy of the earthquake reaches shore, it forms a huge wave called?
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Q: The chemical symbol of positive metal ion ion is written first in ionic compounds.

A:
The chemical symbol of which ion is written first in ionic compounds?
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