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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet The Outer Planets Directed Reading 27-4 Section: The Outer Planets In the space provided, write the letter of the description that best matches the term or phrase. _____ 1. outer planets _____ 2. asteroid belt _____ 3. gas giant _____ 4. Pluto a. a planet with a deep, massive gaseous atmosphere b. the planets that are farthest from the sun; include Jupiter, Saturn, Uranus, and Neptune c. a celestial body that is usually found past the orbit of Neptune d. a ring of debris that separates the inner planets from the outer planets GAS GIANTS _____ 5. How do the gas giants compare with the terrestrial planets? a. The gas giants are larger and denser. b. The gas giants are larger and less dense. c. The gas giants are smaller and denser. d. The gas giants are smaller and less dense. _____ 6. Compared with the terrestrial planets, the gas giants a. have more gravity, which helps them retain gases. b. have less gravity, which helps them retain gases. c. have the same amount of gravity, which helps them retain gases. d. have no gravity, which helps them retain gases. _____ 7. The gas giants have ring systems that are made mostly of a. orbiting moons. b. dust and icy debris. c. comets. d. asteroids and gases. JUPITER 8. Jupiter is the ______________________ planet from the sun. 9.Jupiter’s mass is more than ______________________ times the mass of Earth. Original content Copyright © Holt McDougal. All rights reserved. Additions and changes to the original content are the responsibility of the instructor. Holt McDougal Earth Science 20 Planets of the Solar System Name ______________________________ Class ___________________ Date __________________ Directed Reading continued 10. Jupiter has at least 63 ______________________ , 4 of which are the size of small planets. 11. Describe Jupiter’s Great Red Spot. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ SATURN _____ 12. What is Saturn’s position from the sun? a. Saturn is the fourth planet from the sun. b. Saturn is the sixth planet from the sun. c. Saturn is the closest planet to the sun. d. Saturn is the farthest planet from the sun. _____ 13. How many moons does Saturn have? a. at least 30 b. at least 60 c. at least 75 d. at least 125 _____ 14. How large is Titan, Saturn’s largest moon? a. half the diameter of Earth b. twice the diameter of Earth c. half the diameter of the sun d.twice the diameter of Venus 15. Saturn is the least ______________________ planet in the solar system. URANUS 16. Uranus is the ______________________ planet from the sun and the third largest planet in the solar system. 17. Why is Uranus a difficult planet to study? _______________________________________________________________ _______________________________________________________________ 18.Uranus’s blue-green color indicates that its atmosphere may contain significant amounts of ______________________ , in addition to hydrogen and helium. Original content Copyright © Holt McDougal. All rights reserved. Additions and changes to the original content are the responsibility of the instructor. Holt McDougal Earth Science 21 Planets of the Solar System Name ______________________________ Class ___________________ Date __________________ Directed Reading continued NEPTUNE 19. Neptune is the ______________________ planet from the sun and is similar to Uranus in size and mass. 20. Neptune’s existence was ______________________ before it was actually discovered. 21. How was Neptune’s existence predicted before the planet was actually discovered? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ OBJECTS BEYOND NEPTUNE 22. Pluto is now defined as a _______________________________________. 23. Pluto’s orbit is an unusually elongated and tilted ______________________. 24. How does Pluto compare with other objects in the solar system in terms of its size and distance from the sun? _______________________________________________________________ 25. Describe the Kuiper Belt. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 26. Name two objects that have been found beyond Pluto. _______________________________________________________________ _______________________________________________________________ EXOPLANETS 27. Define exoplanet. _______________________________________________________________ _______________________________________________________________ Original content Copyright © Holt McDougal. All rights reserved. Additions and changes to the original content are the responsibility of the instructor. Holt McDougal Earth Science 22 Planets of the Solar System