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Across 5. the _____ ____ is the SI unit used to express the mass of atoms (Fact 247) 6. the formula for finding density is mass divided by ____ (Fact 183) 7. _______ is when a solid changes directly to a gas; one example of this is dry ice (Fact 234) 9. when forces are acting in the same direction on an object, net force is calculated by _____ the forces together (Fact 91) 11. the ____ ____ of an atom is equal to the sum of its protons and neutrons (Fact 251) 15. any substance with a ______ of less than or equal to one will float in water (Fact 189) 16. _________ are small rocky bodies that revolve around the sun in the region between Jupiter and Mars (Fact 171) 17. the formula used to calculate _____ is distance divided by speed (Fact 79) 19. ______ are subatomic particles that have a positive electrical charge (Fact 241) 21. melting, vaporization and sublimation are _____ changes of state; during these changes the substance absorbs heat energy and particle motion increases (Fact 235) 23. the formula used to calculate ______ is speed multiplied by time (Fact 78) 26. ______ is the ability to do work and cause change (Fact 8) 28. the number of _____ in the nucleus of an atom is the atomic number (Fact 250) 30. ______ is the study of the properties and interactions of matter (Fact 10) 31. any substance with a density of greater than one will most likely _____ when placed in water (Fact 190) 32. _______ has a density of one (Fact 188) 33. a ______ is a meteoroid that has passed through Earth's atmosphere and strikes Earth's surface (Fact 174) 34. the ______ (central core) of an atom holds the protons and the neutrons; this central core has a positive charge (Fact 244)

Down 1. the states of matter are solid, liquid, gas, and ______ (Fact 214) 2. the state of matter that a substance is in depends on how _____ the particles move and how strongly the particles are attracted to each other (Fact 214) 3. an object's _____ changes as it changes location in the universe; this is because gravitational force changes (Fact 111) 4. Newton's second law of motion states that the _________ of an object depends on the mass of the object and the amount of force applied (Fact 125) 5. the formula used to calculate ____ _____ is distance divided by time (Fact 77) 8. an object's _____ does not change when gravitational force changes (Fact 110) 10. when forces are acting on an object in different directions, the net force is calculated by subtracting the smaller force from the larger force (Fact 92) 12. a _____ is a chunk of rock or dust that has broken off an asteroid or a comet; these bodies revolve around the sun (Fact 172) 13. ______ are small bodies of water, ice, and cosmic dust left over from the formation of the solar system; these bodies revolve around the sun (Fact 170) 14. ______ are atoms from a particular element that have the same number of protons but a different number of neutrons (Fact 252) 18. ______ are subatomic particles that are negatively charged (Fact 243) 20. a _______ is a meteoroid that has entered Earth's atmosphere, heats up and produces a streak of light (Fact 173) 22. condensation, freezing, and deposition (when a gas changes to a solid) are example of _______ changes of state; during these changes the substance releases heat energy and particle motion decreases (Fact 238) 24. in a _____ atom, the number of protons equals the number of electrons (Fact 249) 25. _______ are subatomic particles that have no electrical charge (Fact 242) 27. ______ is the study of matter, energy, motion and forces (Fact 11) 29. each proton has a mass of ___ amu, each neutron has a mass of 1 amu and each electron is given a mass of zero amu (Fact 248)