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Across 3. mass is the amount of matter in an object and _______ is the amount of space something occupies (Facts 51 and 63) 7. the moon and _______ shine by reflected sunlight, not by their own light (Fact 175) 9. condensation is when a gas changes to a _______ (Fact 236) 11. Melting, vaporization, and sublimation are _______ changes of state; during these changes the substance absorbs heat energy and particle motion increases (Fact 235) 14. Earth's gravitational force pulls everything towards the ______ of the Earth; gravitational force is about the same everywhere on Earth (Fact 106) 16. the ______ (central core) of an atom holds the protons and the neutrons; this central core has a positive charge (Fact 244) 17. the ____ ______ is the galaxy we live in; our solar system is located in one of the inner arms of this galaxy (Fact 181) 18. the outer planets are also called ____ _____ because they do not have solid surfaces (Fact 153) 21. ______ is the rate at which velocity (speed and direction) changes over time (Fact 82) 23. in a controlled experiment, the factor that is expected to change because of the manipulated variable is called the ______ variable; it is the factor that is being measured or tested (Fact 23) 26. ______ is the type of vaporization that occurs throughout a liquid and below the liquid's boiling point (Fact 233) 27. atoms are made of three _________ (particles that are smaller than the atom itself) known as protons, neutrons, and electrons (Fact 240) 28. the four inner or ______ planets are Mercury, Venus, Earth, and Mars; all of these planets are small and dense and have rocky surfaces (Facts 139 and 140) 29. the formula for finding ______ is mass divided by volume (Fact 183) 30. ______ is the force that is exerted when matter is pulled or stretched and compression is the force that is exerted when matter is pushed or squeezed (Facts 96 and 97)

Down 1. most of the ______ in an atom is found in the nucleus (Fact 245) 2. the outer planets are ______, Saturn, Uranus, and Neptune (Fact 152) 4. density is the amount of ______in a given volume (Fact 182) 5. vaporization is when a liquid changes into a ____; the two types are boiling and evaporation (Fact 231) 6. ______ is a liquid's resistance to flowing. This property of a liquid depends on the size and shape of its particles and the attractions between them (Fact 22) 8. an ________ is the smallest particle into which an element can be divided and still be the same substance (Fact 239) 10. when the moon is _______, the sunlit portion we see from Earth is getting larger and when it is waning the sunlit portion we see from Earth is getting smaller (Facts 163 and 164) 12. electrons are found in the _____ ______ area of an atom; this area accounts for most of the space in an atom (Fact 246) 13. In a controlled experiment, the ________ variables are intentionally kept the same; they are the factors not being tested (Fact 24) 15. _____ is the type of vaporization that occurs on the surface of a liquid and below the liquid's boiling point (Fact 232) 19. in a controlled experiment, the _______ variable is the factor that is purposely changed (Fact 22) 20. neutrons have no electrical charge; they each have a charge of _____ (Fact 242) 22. all matter is affected by _____; gravitational force pulls objects towards each other (Fact 105) 24. each _______ has a positive electrical charge (Fact 241) 25. _______ are negatively charged (Fact 243)