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Across 3. a state of matter in which the molecules are tightly packed together 6. the way in which light and sound energy travel 11. a type of mixture in which the ingredients are thoroughly mixed together 12. the measure of the pull of gravity on an object 14. a collection of materials in which the materials do not join together 17. the bouncing of light from a surface, mirror 19. the state of matter that has a definite volume and takes the shape of the container it is placed in 21. the amount of matter in an object 23. a change that occurs in a substance that cannot be reversed 25. material that prevents energy from traveling through it 26. anything that has mass and takes up space 27. the ability to do work; the ability to cause change and make things happen

Down 1. a state of matter in which the molecules are very far apart 2. an object used to refract light 4. a resource that cannot be used up (wind, sun, water) 5. a push or a pull on an object 7. a form of energy in which vibrations can be heard 8. the back-and -forth movement of an object that produces sound 9. the units that make up matter in its solid, liquid, or gas forms 10. a tool used to determine if an object has magnetism 13. the tendency of a moving object to keep moving or a still object to remain at rest 15. the bending of light as it passes through objects 16. change in an object's position 18. the force between poles of magnets 20. a force that opposes, or acts against, motion when two surfaces rub against each other 22. material that allows energy to travel through it easily 24. a closed path through which electicity travels