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Across 2. Small pieces of rock and/or metal that speed through space. It is called a meteorite if it reaches the Earth’s surface. 5. The act of driving something forward through the use of a powerful force. 7. The highest layer of the Earth’s atmosphere, which goes all the way to outer space. This is where the space shuttle and satellites usually orbit. 8. The gas in the Earth’s atmosphere which all animals breathe in order to survive. 10. The mountain ranges on the moon, made of light-colored rock. 13. A heavy, colorless gas created in part from the burning of fossil fuels. (2 Words) 15. The area on the moon where the Apollo astronauts landed. (3 Words) 16. The Latin word meaning sea or ocean; the name given to the dark, flat regions of the moon by Galileo. 17. The condition of experiencing little or no effects of gravity. 20. The repeating pattern of views of the moon’s surface as seen from Earth, caused by the amount of the moon’s surface illuminated by the sun at different times during a 291/2 day cycle. (4 Words) 21. The third layer of the Earth’s interior, made up of a very thick layer of rock. 22. The powerful rocket that propelled the Apollo missions to the moon. (2 Words) 23. The term used by scientists to describe the Earth's distance from the sun, where temperatures allow water to exist in a liquid state, which is necessary to support life. (2 Words) 25. A protective layer of the Earth’s atmosphere that absorbs the harmful ultraviolet rays of the sun. (2 Words) 27. The daily rise and fall of ocean water on the Earth, caused by the gravitational pull of the moon. 30. The force of a rocket’s engines used to counter the Earth’s pull of gravity, enabling it to lift off. 31. The second layer of the Earth’s atmosphere that includes the ozone layer. The layer in which jet planes fly. 32. The third planet from the sun, featuring a breathable atmosphere containing oxygen, large amounts of liquid water and a range of temperatures suitable for sustaining life. 33. A natural satellite of a planet

Down 1. The layer surrounding the Earth’s inner core, composed of very hot liquid metals and rock, called lava, which sometimes comes to the Earth’s surface in volcanic eruptions. (2 Words) 3. The far side of the moon that never faces the Earth. (5 Words) 4. A hot ball of solid metals at the center of the Earth. (2 Words) 6. When the moon’s orbit places it directly in the shadow of the Earth. (2 Words) 9. The continuing process of evaporation, condensation and precipitation that recycles the Earth’s water supply. (2 Words) 11. Having to do with the moon, taken from “luna,” the Latin word for the moon. 12. An Italian astronomer who studied the moon. (2 Words) 14. The layers of gases that surround a planet. 16. The third layer of the Earth’s atmosphere that protects us from objects such as meteoroids. 18. when the moon’s orbit places it directly between the Earth and the sun, temporarily blocking out the view of the sun from the Earth. (2 Words) 19. Men and women who travel to space. 24. The process of wearing away rock and soil by water, wind and glaciers. 26. Indentations on the surface of the moon caused by meteoroids crashing into its surface. 28. The Earth's surface layer, covered with rocks, clay, sand and soil. It is thin and broken into huge pieces called plates. 29. The series of NASA missions that traveled to the moon and back.