Q: Fact: scraping an object may cause small particles to break off of that object
Question: Scraping the side of a cliff may result in

A: sand

Q: Fact: deep sea animals live deep in the ocean
Question: which one of these animals lives deepest in the ocean?

A: a vampire squid

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: as the available water in an environment increases , the populations of organisms in that environment will increase
Question: To aid in increasing the population of an organism in an environment

A:
introduce more water sources