Earth

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Across
  1. 5. the violent shaking of the surface of the Earth
  2. 6. a group of islands
  3. 7. a large amount of ice, snow, and rock falling quickly down the side of a mountain
  4. 9. an imaginary line running across the centre of the Earth from West to East
Down
  1. 1. an opening in Earth's crust where magma breaks through, raining down molten rock, ash and gases
  2. 2. a huge mass of ice that moves slowly over land
  3. 3. the deepest known point on Earth
  4. 4. The word comes from the Finnish word "tunturi", meaning treeless plain. These are found in the Arctic and on the tops of mountains
  5. 8. a device used to find direction and always points towards North
  6. 10. a book of maps