4th quarter Exam 6th grade

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Across
  1. 3. fourth planet from the Sun; has polar ice caps, a thin atmosphere, and a reddish appearance caused by iron oxide in weathered rocks and soil.
  2. 6. seventh plant from the Sun; is large and gaseous, has a distinct bluish-green color, and rotates on an axis nearly parallel to the plane of its orbit.
  3. 7. observed Venus using his telescope
  4. 8. Moon phase that occurs when the Moon is between Earth and the Sun, at which point the Moon cannot be seen because its lighted half is facing the sun and its dark side faces Earth.
  5. 10. change in appearance of the Moon as viewed from the Earth, due to the relative positions of the moon, Earth and Sun.
  6. 12. usually the eighth planet from the Sun; is large and gaseous, has rings that vary in thickness, and is bluish-green in color
  7. 14. occurs when the Moon passes directly between the sun and Earth and casts a shadow over part of the Earth.
  8. 17. smallest planet, closest to the Sun; does not have a true atmosphere; has a surface with many craters and high cliffs.
  9. 18. a hollow left on the surface of the Moon caused by an object striking its surface.
  10. 19. discovered that the planets travel in elliptical paths around the Sun at different speeds
  11. 20. system of eight planets, including Earth, and other objects that revolve around the Sun.
  12. 21. describes phases following a new moon, as more of the Moon’s lighted side becomes visible.
  13. 22. Second planet from the Sun; similar to Earth in mass and size; has a thick atmosphere and a surface with craters, fault-like cracks, and volcanoes
Down
  1. 1. describes phases that occur after a full moon, as the visible lighted side of the Moon grows smaller.
  2. 2. a dwarf planet; nine planets away from the Sun; has a solid icy rock surface and a moon almost as big as itself, Charon
  3. 4. second-largest and sixth planet from the Sun; has a complex ring system, at least 31 moons, and a thick atmosphere made mostly of hydrogen and helium.
  4. 5. phase that occurs when all of the moon’s surface facing Earth reflects light.
  5. 9. Giant. High-pressure storm in Jupiter’s atmosphere
  6. 11. occurs when Earth’s shadow falls on the Moon
  7. 13. dark-colored, relatively flat regions of the Moon formed when ancient lava reached the surface and filled craters on the Moon’s surface.
  8. 15. developed the theory that the Sun was the center of the solar system.
  9. 16. largest and fifth planet from the Sun; contains more mass than all the other planets combined, has continuous storms of high-pressure gas, and an atmosphere mostly of hydrogen and helium.
  10. 23. third planet from the sun; has an atmosphere that protects life and surface temperatures that allow water to exist as a solid, liquid, and gas.