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Name: _______________________________ Period: ________ Study Notes: Chapter 27- Planets of the Solar System 1. The early oceans became ______________ when dissolved solids were carried from land into the oceans. 2. About ____________ of all matter contained in the solar nebula now exists in the sun. 3. Small bodies that orbit planets are called ________________. 4. When early Earth’s atmosphere formed, _________________ and hydrogen gases were lost because Earth’s ______________ was too weak. 5. Copernicus proposed a _________________ model of the universe, in which the planets revolve at different speeds around the sun. 6. Mars’s volcanoes are ______________ than those of Earth because Mars has no moving tectonic plates. 7. Impact ________________ are caused by collisions with _________________ in space. 8. Venus is a planet with a runaway ____________________ effect. 9. The factors that contribute to Mercury’s daily temperature fluctuation of about 600°C are the planet’s slow ________________ and it is the closest planet to the ______________. 10. A region of the solar system just _________________ Neptune’s orbit, which contains small bodies made mostly of ice, is called the ____________________ belt. 11. Neptune’s Great ______________ _____________ is a giant _________________. 12. The least _______________ planet in the solar system is ____________________. 13. The right combination of temperature, water, and oxygen supports life on Earth. 14. Kepler’s first law states that planets orbit the sun in paths called ellipses. 15. Young Earth formed a core, mantle, and crust in a process called ________________________. 16. ______________ is a planet which has _____________________ regions that may still be active. 17. The early _________________________ developed when many volcanic eruptions released large amounts of gases in a process called _________________________. 18. _______ is the planet that has ___________ like Earth’s because its axis tilts at an almost identical angle. 19. A rotating cloud of gas and dust from which Earth’s solar system formed is called a solar ____________. 20. When the solar system formed, smaller bodies joined together through collision and the force of _________________ to form larger bodies called _____________________. 21. Jupiter’s Great _________ Spot and _____________ Great Dark Spot are both raging _______________. 22. Around the __________ of Earth is an iron- and magnesium-rich rock layer called the ______________. 23. _____________________ that circle stars other than Earth’s sun are called ___________________. 24. The ____________________ belt can be found between the planets _____________ and Jupiter. 25. Small bodies from which planets originated during the early ___________________ of the solar system are called ____________________________.