Chapter 28 Vocab

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Across
  1. 1. , A fragment of a meteoroid that has survived the journey through the Earth's atmosphere and has landed on the Earth's surface.
  2. 3. , A region of the solar system where there is a concentration of small, rocky or icy bodies, such as the asteroid belt between Mars and Jupiter.
  3. 6. , Small, rocky or icy bodies that formed in the early solar system and eventually came together to form planets.
  4. 8. , The visible trail of light created by a meteoroid as it enters the Earth's atmosphere and vaporizes due to friction with the air.
  5. 11. Belt , A region of the solar system beyond Neptune where many small, icy bodies and dwarf planets are located.
  6. 13. Motion , The apparent backward motion of a planet as seen from Earth, due to the difference in the orbital speeds of Earth and the planet.
  7. 15. , A small, rocky or metallic object in space, typically smaller than a kilometer in size.
  8. 17. , Steep, cliff,like features on the surface of a planet or moon, formed by tectonic activity.
Down
  1. 2. Planets , The four inner planets of the solar system , Mercury, Venus, Earth, and Mars which are primarily composed of rock and metal.
  2. 4. Shower , A celestial event in which a large number of meteors can be seen entering the Earth's atmosphere in a short period of time,
  3. 5. Unit , The average distance between the Earth and the Sun, approximately 93 million miles
  4. 7. Metallic Hydrogen , A form of hydrogen that is thought to exist in the cores of gas giant planets, where extreme pressure and temperature cause it to take on metallic properties.
  5. 9. , A closed curve that describes the shape of an orbit, with the two foci located at the ends of the major axis.
  6. 10. , A measure of how elongated or flattened an orbit is, defined as the distance between the foci of an ellipse divided by its major axis.
  7. 12. , A region of the solar system where there is a relatively clear space, such as the zone between Jupiter and Saturn where the Kuiper Belt is located.
  8. 14. Giant Planets , The four outer planets of the solar system Jupiter, Saturn, Uranus, and Neptune which are primarily composed of hydrogen, helium, and other gasses.
  9. 16. Planet , A celestial body that orbits the Sun and has enough mass to be spherical in shape, but has not cleared its orbit of other debris, such as Pluto.