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Across 1. an instrument used for veiwing objects that are to small to see with the naked eye 7. carried by electrons 9. a type of pure substance that cannot be broken down 11. The weight of a substance 13. a mixture of two or more compounds 16. a thin layer surrounding the earth 17. in a cell, an organelle with double layered membrane surrounding the cell's DNA 19. a switch that auotmaticly breaks an electric circuit when a large amount of current flows through 20. a material which contains movable electric charges 24. the sun, all the planets, and all the constellations in it. 25. the distance that a beam of light travels in a vacuum in one year 26. the process by which DNA from each parent combine to form one new cell 28. change of state from a liquid to a gas 30. the amount of mass in a certain unit volume of a substance 35. a material that resists movable electric charges 37. an object that has so much gravity that not even light can escape it 41. a fertilliazed egg during early development 43. a type of mechanical mixture, where one or more substances are evenly distributed 44. change of state from a liquid to a solid 46. a huge accumulation of stars, gas and dust held together byt gravity 49. a Homogenerous mixture of two or more pure stubstances 51. substance release from certain glands to control particular body activities 53. a flow of electric charge 54. the amount of space matter consumes 55. an external sexual organ on the males anatomy 56. a large rock that enters the earths atmosphere burning hott and bright

Down 2. describes the ability of a substance to react with another chemical 3. carried by protons 4. a pure stubstance with only one compound 5. a body that orbits around the sun. 6. the male sex horomone 8. a group of stars that form a pattern. 10. positvely charged particle forming part of the nucleus of an atom 12. a rock that orbits the sun and has a tail, which is dusk and other debree 14. two single stars orbiting one another 15. in a cell, a structure carrying genetic material from the parent cell 18. the process of making an exact copy of another living organism 21. a solution that can conduct an electric current 22. the stage in which duplicated chromosones are in a line across the middle of the cell 23. the monthly shedding of the uterine linning that occurs if fertiliazation does not occur 27. the female sex horomone 29. a term referring to matter having niether a negative nor a positive electric charge 31. a device for turning electric current on and off 32. the measure of resistance of a liquid 33. a negativly charged particle found orbiting the nucleus of an atom 34. the galaxy that includes out sun, earth, appears as a hazy white band in the sky 36. a machine that orbits the sun. 38. an interconnection of electrical elements 39. a combination of electrons cells that produce a potental difference 40. a large rock orbiting the earth. 42. a muscular passageway leading from the uterus to the outside of the females anatomy 45. the process by which genetic material duplicated divides into two identical sets of chromosons 47. a pure substance that desolves to form a solution 48. a substance that desolves in a solvent 50. a particle carrying no charge and forming part of the nucleus of an atom 52. the course that planets take around the sun.