Water

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Across
  1. 4. Can the average human survive without water for a few days or a few weeks?
  2. 5. The solid state of water is known as what?
  3. 6. What is another name for a tidal wave?
  4. 8. Water is made up of what two elements?
  5. 9. What is the longest river on Earth?
  6. 10. What is the chemical formula of water?
Down
  1. 1. Nimbus, cumulus and stratus are types of what?
  2. 2. When water is cooled, does it contract or expand?
  3. 3. The deepest point in all of the world’s oceans is named what?
  4. 7. Pure water has a pH level of a around what number?