Why is water necessary for rusting to happen?

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride

All forces cause motion? true or false

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.