Elements in Daily Life

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Across
  1. 3. What hydroxide that were added to make the fire retardant?
  2. 4. What element essential for building and maintaining healthy bones and teeth?
  3. 5. what chemical that help prevent thing from catching fire?
Down
  1. 1. _______ kill bacteria,it is used to treat drinking water and swimming pool water.
  2. 2. people at work,home or around town demand technologu that can keep up with their fast-placed.It had made some incredible technological advances