Q: Fact: a balance is used for measuring weight of a substance
Question: A balance is used to measure the what of a substance?

A: heaviness

Q: Fact: the Appalachians were formed by rock folding
Question: The Appalachians reach amazing heights because of how stone

A: piles together

Q: Fact: tidal energy can be used to produce electricity
Question: Where's the best place to use water to power a lighthouse?

A: the ocean

Q: Fact: riding a bike does not cause pollution
Question: What can an individual do to REDUCE their pollution levels?

A:
replace their driving to work with biking