Across
- 2. energy that is transferred as a consequence of temperature differences
- 3. a dense, icy pack of old snow
- 7. a gradual change
- 11. the sum of all water on a planet
- 14. the mass of air surrounding a planet
- 15. the phenomenon that occurs when individual molecules are so strongly attracted to each other that they tend to stay together, even when exposed to tension
- 16. a measure of the energy of random motion in a substance's molecules
- 17. the quantity of a substance within a certain volume
- 19. a measure of the mass of dissolved salt in a given mass of water
- 20. a steady condition that prevails day in and day out in a particular region of the earth
- 22. a substance that contains different compounds and/or elements
- 23. the region of the atmosphere above an altitude of roughly 460 km
- 24. a chemical process by which oxygen reacts with a fuel to release energy
- 25. an atom that has lost or gained electrons so it has a net electrical charge
- 26. a community of organisms, along with their environment, functioning as a unit
- 27. an instrument used to measure atmospheric pressure
Down
- 1. magma that flows out of a volcano
- 2. the moisture content of air
- 4. a substance composed of only one type of molecule
- 5. a poisonous gas composed of three oxygen atoms bonded together
- 6. the process by which a gas turns into a liquid
- 8. evaporation and condensation of a mixture to separate out the mixture's individual components
- 9. the smallest chemical unit of matter
- 10. a substance that does not conduct electricity very well
- 12. the use of electricity to break a molecule down into smaller units
- 13. evaporation of water from plants
- 18. a collection of atoms that all have the same number of protons
- 21. the lower layer of earth's atmosphere, which exists from ground level to roughly 80km above sea level