fact and question: as the smoothness of something increases , the friction of that something will decrease when its surface moves against another surface
Question: As an airboat moves from grass to water it will

What's the answer?

answer: speed up


fact and question: an landfill is a source of pollution
Question: A person can see a large pollutant source when looking at

What's the answer?

answer: trash heaps


fact and question: biofuel is used to produce electricity by burning
Question: Materials like ethanol are used to produce electricity by _____.

What's the answer?

answer: burning


fact and question: snowy means a large amount of snow
Question: Snowy means a large amount of what?

What's the answer?

answer:
ice particles