Questions and Exercises.
1. How is rust formed? 2. Explain why things which are made of iron should be painted. 3. A grate full of coals burns away and only a small quantity of ash is left in the grate. What has become of the coals?
1. How is rust formed? 2. Explain why things which are made of iron should be painted. 3. A grate full of coals burns away and only a small quantity of ash is left in the grate. What has become of the coals?