Effects of climate change in the Arctic more extensive than expected

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Across
  1. 2. a North American country consisting of ten provinces and three territories.
  2. 3. defrost or melt.
  3. 4. an element that is bound to two oxygen atoms.
  4. 5. an odourless, colourless flammable gas.
  5. 6. average temperature for a place over a certain time.
  6. 7. frozen water.
  7. 8. large in degree or scale.
  8. 10. a thick layer of frozen soil.
  9. 12. the level or nearly level treeless plain between the ice cap and the timber line of North America, Europe, and Asia that has permanently frozen subsoil
  10. 13. has the symbol ‘C’ and is number 6 on the periodic table.
Down
  1. 1. water vapour in the atmosphere that has frozen into ice crystals and falls to the ground in the form of flakes.
  2. 2. when something becomes or is made different.
  3. 3. the measurement of hot and cold.
  4. 9. a large amount of water covering a lot of the earth.
  5. 11. the northernmost point of the earth.