fact and question: pollution is a source of pollutants
Question: Pollution is caused by

What's the answer? OPTIONS:
- reusing cloth baby diapers
- recycling plastic water bottles
- using all natural household cleaners
- prescription medicine being put down sink drains

answer: prescription medicine being put down sink drains

fact and question: creating paper requires cutting down trees
Question: Trees are mulched and liquefied before being dried to make

What's the answer? OPTIONS:
- houses
- paper
- toothpicks
- floors

answer: paper

fact and question: a cavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone
Question: the presence of which of these is required for the formation of cavernous chambers?

What's the answer? OPTIONS:
- some carbonated soda
- some carbon dioxide
- some carbonic acid
- carbon monoxide gas

answer: some carbonic acid

fact and question: winter is when a hemisphere is tilted away from the sun
Question: When it gets dark the earliest in California it is

What's the answer? OPTIONS:
- the time California is closest to the sun
- the time Australia is closest to the sun
- the time Europe is closest to the sun
- the time Mexico is closest to the sun

answer:
the time Australia is closest to the sun