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Science Crossword Puzzle

Across
Used in nuclear reactors yo produce electricity and power in some ships
Used for electricity
Found in a gaseous state
Chemicals produced from oil
Comes in several grades
Used to separate metal in the ore from the other materials
Materials with usable amounts of metal in them
Often used as lubricant or a fuel
"liquid rock"
Concentrated areas of specific minerals
Down
Three-fourths of the earths surface
Solid substance found naturally in the earth
Very strong and lightweight
Carry out over 50% of the exchange of oxygen and carbon dioxide on Earth
The upper layer of earth in which plants grow
Soft or shapeable
A red-orange metal
Very plentiful and useful
Malleable
Is easy to scratch and it tarnishes