1
2					3
											4
		5							6
	7
		8									9
									10
			11				12										13
															14				15
	16
	17													18
									19
20
										21

Across 2. Mars is the fourth planet from the sun, is called the _____ ______, has a lot of volcanic activity, and has two moons (Fact 53) 4. A scientific ______ is a statement that describes what scientists expect to happen under a certain set of conditions (Fact 4) 5. ______ is the seventh planet from the sun and is tipped on its side (Fact 63) 7. A ______ ___ occurs when the moon moves in between the Earth and the sun. The shadow of the moon falls on the Earth (Fact 49) 8. Asteroids are small rocky bodies that revolve around the sun in a region called the _____ ______; this region is located between the orbits of Mars and Jupiter (Fact 67) 10. A scientific _______ is a well tested explanation for a wide range of experimental results (Fact 3) 16. The four inner or ______ planets are Mercury, Venus, Earth, and Mars (Fact 33) 18. _______ is the sixth planet from the sun, is the second largest planet, is the least dense planet, and has the largest rings of all the gas giants (Fact 62) 19. A _________ is a meteoroid that has passed through Earth's atmosphere and stricken Earth's surface (Fact 70) 20. A ________(shooting star) is a meteoroid that has entered Earth's atmosphere, has heated up, and prduces a streak of light (Fact 69) 21. ______ are small bodies made of water, ice, and dust left over from the formation of the solar system (Fact 66)

Down 1. Earth has only one moon. The changing appearances of Earth's moon are known as ______ (Fact 41) 3. *A _____ ____ occurs when the Earth moves in between th moon and the sun. The shadow of the Earth falls on the moon (Fact 47) 6. The outer planets are also known as gas giants. Gas giants are planets that do not have _____ surfaces (Fact 57) 9. Neptune is eighth planet, is farthest from the sun, and is known as the ____ _____ (Fact 64) 11. A _______ is a factor that can be tested in a controlled experiment. (Fact 14) 12. A _________ is a chunk of rock that has broken off from an asteroid or a planet and they revolve around the sun (Fact 68) 13. The four outer planets are Jupiter, Saturn, Uranus, and ______. (Fact 66) 14. ________ are huge groupings of stars in space (Fact 75) 15. Mercury and Venus are the only two planets that do not have ______ (Fact 39) 17. _______ on Earth are caused by differences in how much the moon's gravity puuls on different parts of the Earth (Fact 48)