Across
- 3. What hydroxide that were added to make the fire retardant?
- 4. What element essential for building and maintaining healthy bones and teeth?
- 5. what chemical that help prevent thing from catching fire?
Down
- 1. _______ kill bacteria,it is used to treat drinking water and swimming pool water.
- 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