Francisco's Crossword

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Across
  1. 3. A piece of land surrounded by water
  2. 4. A chain of Islands formed of coral
  3. 6. The fourth letter on the Greek alphabet
  4. 7. A mountain or hill where lava pours out of
  5. 8. An half open valley on a mountain side
Down
  1. 1. A place where water and food can be found in a desert
  2. 2. A large amount of water falling from one place
  3. 3. Area of flat ground
  4. 5. A place on the coast where boats enter
  5. 8. An artificial waterway