Across
- 2. This type of metal reacts with water and is in group one.
- 3. This is what people need to be always.
- 4. This is the name given to two or more elements chemically bonded together
- 5. What element does a water molecule only have one of?
- 6. Some oceans have a lot of this which is man-made.
Down
- 1. This is what we call tiny life forms.
- 3. What element is in the chemical formula for water twice?