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Across 4. way to change liquid to a gas 5. resistance when two objects move against each other 6. amount of salt in water 8. current that flows from Atlantic Ocean to Europe 9. plants with no tubes like moss and liverwort 10. two or more atoms combined 13. at the end of every food chain 16. an if, then statement that makes an educated guess 17. examples are nitrogen, carbon, and silver 18. examples are snakes, turtles, sharks, and bats 19. breaking down of rock to smaller pieces 20. plate movements that cause earthquakes

Down 1. producer in ocean 2. number of sound waves per second, goes with pitch 3. state of matter that is tightly packed 7. some light can come through 11. color with shortest wavelength 12. when electrical energy transforms to motion 14. looking in the mirror is an example 15. rocks formed from melting and cooling