chapter 1

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Across
  1. 1. The gaseous envelope surrounding Earth.
  2. 3. The shape of Earth, which is slightly flattened at the poles.
  3. 5. All the water on Earth's surface, including oceans, lakes, and rivers.
  4. 8. The frozen water part of Earth's system.
  5. 10. The regions of Earth where life exists.
  6. 12. Angular distance east or west of the prime meridian.
  7. 14. The latitude line at 0 degrees.
  8. 15. The point in Earth's orbit when it is closest to the Sun.
Down
  1. 2. A line of latitude circling Earth parallel to the equator.
  2. 4. The rigid outer layer of Earth, including the crust and upper mantle.
  3. 6. loop A system where outputs affect inputs, either amplifying or reducing changes.
  4. 7. Planets closer to the Sun, smaller and rockier than outer planets.
  5. 9. The movement of Earth around the Sun, taking about one year.
  6. 11. Angular distance north or south of the equator.
  7. 13. Outer planets made mostly of gas and much larger than inner planets.