Earth and Air Crossword Puzzle
Download and print this "Earth and Air" crossword puzzle, or solve it online directly in your browser. For the printable version, use a pencil or pen to fill in the answers. The completed answers are included, so you can easily check your work when you're finished.
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QUESTIONS LIST:
- sediment : the solid sludge layer at the bottom of the tank
- aerobic : digestion carried out by microorganisms in the presence of air
- potable : water that is safe to drink
- boiling point : for water this is 100oc
- filtering : removes solid particulates
- sterilization : process which uses uv, ozone or chlorine
- desalination : the process in which salt is removed
- distillation : requires high temperature to boil water
- reverse osmosis : removes salt using high pressure
- crude oil : formed millions of years ago from plankton
- coal : formed millions of years ago from dead plants
- carbon footprint : the amount of carbon dioxide released during a products lifetime
- acid rain : nitrogen oxides and sulfur oxides form this
- combustion : reaction in which fuels react with oxygen
