It is insoluble and difficult to clean up. It dissolves in water and causes acid rain. It enter storm drains and contaminates surface water. It leaks onto the ground and contaminates soil and ground water.
I gave my students this multiple choice question: Which environmental risk is not associated with the disposal of used motor oil from cars?

Only one answer is correct among these 4 choices:
- It is insoluble and difficult to clean up.
- It dissolves in water and causes acid rain.
- It enter storm drains and contaminates surface water.
- It leaks onto the ground and contaminates soil and ground water.

Could you tell me which one is correct?

It dissolves in water and causes acid rain.