Some scientists study asteroids that could potentially impact Earth Which mechanism could be used to best protect against this type of possible natural hazard?

Answer///precipitate;

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).

What are the activitys?   sorry if this took your points : (

Answershower asap; wash for 15 min. take off all clothing.