Natural world

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Across
  1. 1. The up and down movements of water in the sea
  2. 5. The part of land near the sea
  3. 6. The body of salt water which covers 70% of the Earth's surface
  4. 7. The planet on which we live
  5. 8. An open land area with no buildings
  6. 9. An area of land with dense forest and a lot of vegetation
  7. 11. A big natural elevation of the Earth's surface
Down
  1. 2. An opening in a planet's surface through which rock, hot gases or other materials erupt
  2. 3. A large body of water surrounded by land
  3. 4. An area of lanf smaller than a continent and completely surrounded by water
  4. 5. A large mass of land considered a collective region.There are seven in the world
  5. 10. A large amount of water flowing continually