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Across 1. particles in a _________ are broken apart, are electrically charged, travel at the highest speeds, and are not affected by magnetic fields (Fact 238) 4. _________ is the amount of space a substance occupies (Fact 221_ 6. ________________ is when a substance changes directly from a solid to a gas without passing through the liquid state first. (Fact 244) 10. the ________ is spherical, is the innermost layer of the Earth, has a diameter of about 6800 kilometers, and is made mostly of iron (Fact 123) 13. _________ occurs when a substance changes from a gas to a liquid (Fact 246) 14. ______ is when a gas changes directly to a solid without passing through the liquid state first (Fact 247) 15. particles in a ________ are loosely connected, can break some of the attraction between them, and slide past each other (Fact 236) 17. the ________ of an earthquake is the point on Earth's surface directly above an earthquake's starting point (Fact 135) 19. particles in a _______ are closely packed together, are strongly attracted to each other and vibrate in place (Fact 235) 20. particles in, a _________ can move close together or far apart, can break most of the attraction between them and travel at high speeds (Fact 237) 21. ___________ is when a substance changes from a solid to a liquid (Fact 242)

Down 1. Changes of state occur due to changes in _________ and changes in temperature (Fact 239) 2. During all changes of state, the substance either absorbs or releases enough ________ _______ (heat) to change particle arrangement and particle motion (Fact 240) 3. the ___________ of an earthquake is the point inside the Earth where the earthquake begins (Fact 136) 5. ________ is the tendency of the body to maintain a stable internal environment (Fact 200) 7. the ___________ is the middle layer of the Earth, is mostly solid, and is about 2900 kilometers thick (Fact 121) 8. ____________ is when a liquid changes to a gas (Fact 243) 9. _________ is the amount of matter that makes up a substance (Fact 220) 11. a ______ _______ is a diagram that shows the many energy pathways in an ecosystem (Fact 151) 12. a ______ ______ is a diagram that shows the transfer of energy from one organism to the next (Fact 152) 16. ________ is when a substance changes from a liquid to a solid (Fact 245) 18. the high point of a wave is the crest and the low point is the _________ (Fact 202)