The world's issues

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Across
  1. 4. To change from a solid to a liquid state due to heat.
  2. 7. A piece of land surrounded by water on all sides.
  3. 13. The process where gases in Earth's atmosphere trap heat from the sun.
  4. 15. A line or group of connected mountains.
Down
  1. 1. A slowly moving mass of ice formed from compacted snow.
  2. 2. Unwanted or unusable materials; rubbish.
  3. 3. A sandy or pebbly shore by the ocean or a lake.
  4. 5. A large, extremely dry area of land with little or no vegetation.
  5. 6. A steep, high rock face, especially at the edge of the sea.
  6. 8. The natural world in which people, animals, and plants live.
  7. 9. A permanent layer of ice covering a large area of land, smaller than an ice sheet.
  8. 10. A prolonged period of abnormally low rainfall, leading to water shortage.
  9. 11. The presence of harmful substances in the environment.
  10. 12. Energy sources like coal, oil, and gas, formed from ancient organic matter.
  11. 14. To process used materials to make new products.