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Across 5. breaking down of rock to smaller pieces 9. two or more atoms combined 14. producer in ocean 16. plate movements that cause earthquakes 17. at the end of every food chain 18. amount of salt in water 19. color with shortest wavelength 20. examples are snakes, turtle, sharks, and bats

Down 1. rocks formed from melting and cooling 2. way to change liquid to a gas 3. some light can come through 4. number of sound waves per second, goes with pitch 6. examples are nitrogen, carbon, and silver 7. state of matter that is tightly packed 8. when electrical energy transforms to motion 10. an if, then statement that makes an educated guess 11. current that flows from Atlantic Ocean to Europe 12. plants with no tubes like moss and liverwort 13. looking in the mirror is an example 15. resistance when two objects move against each other