Ice World: Crossword Puzzle

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Across
  1. 2. Ground that remains completely frozen for at least two years straight.
  2. 5. The northernmost region of Earth, primarily consisting of the Arctic Ocean.
  3. 8. A large piece of freshwater ice that has broken off a glacier and is floating in open water.
  4. 10. The measure of how much sunlight a surface reflects (high in ice, low in water).
Down
  1. 1. The natural light display in the sky, often seen in high-latitude regions.
  2. 3. A vast treeless plain where the subsoil is permanently frozen.
  3. 4. A potent greenhouse gas trapped in frozen polar soils.
  4. 6. Tiny crustaceans that are a primary food source for many polar animals.
  5. 7. A flightless bird found almost exclusively in the Southern Hemisphere.
  6. 9. A slowly moving mass of ice formed by the accumulation of snow.