Across
- 1. ___ lasting longer than iron
- 4. the ___ was made in two phases
- 7. the ___ was invented by alexander graham bell
Down
- 1. the ___ was able to mass produce clothes
- 2. score of power
- 3. ___ make children have to work
- 5. ___edison invented the arc lamp
- 6. a thick black liquid deep beneath the ground