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Across 2. ________ is the planet second closest to the sun and is most like Earth in size, shape and density (Fact 36) 8. Venus has the densest atmosphere of all of the inner planets; its atmosphere is made of sulfuric acid and ____ ____gases (Fact 37) 9. A_____ ______ is a unit of length that is equal to the distance light travels in one year. This is a distance of about 9.5 trillion kilometers (Fact 31) 10. In a controlled experiemnt, the ________ or dependent variable is expected to change because of the manipulated variable (Fact 16) 11. When the moon is ______, the sunlit portion or side we see from Earth is getting larger (Fact 43) 13. Scientists make observations when they use their senses to gain _______ (Fact 8) 17. _______ is the third planet from the sun and has a circumference of approximately 40, 000 kilometers or 24,900 miles (Fact 40) 19. ________ is the smallest planet and is located closest to the sun. (Fact 35) 20. Technology is the application of knowledge, _______ and materials to solve problems (Fact 5)

Down 1. A _______ is a natural satellite that orbits a planet. Mercury and Venus do not have any of these (Fact 39) 3. The steps of the scientific method (scientfic inquiry) are ask a question, form a hypothesis, test the hypothesis, analyzt the results, draw conclusions and communicate the results (Fact 7) 4. In a controlled experiment, the manipulated or _______ variable is purposely changed (Fact 16) 5. When the moon is _______ ,the sunlit side we see from Earth is getting smaller (Fact 44) 6. Scientists make inferences or reasoned judgments to explain _________ (Fact 9) 7. An ________ occurs when the shadow of one celestial body falls on another. (Fact 46) 12. _____ _____ are often used to show relationships between the manipulated variable and the responding variable in an investigation. (Fact 21) 14. It takes the moon about a ______ or 29.5 days to revolve around the Earth (Fact 45) 15. The four ______ or terrestrial planets are Mercury, Venus, Earth and Mars (Fact 33) 16. All of the inner planets are small, dense, and have _______ surfaces (Fact 34) 18. The sun is a _______sized star made mostly of hydrogen and helium (Fact 29)