I can't see the well but chemical changes happen when a substance combines with another to form a new substance. These processes are called chemical reactions and are not reversible except if you do more chemical reactions... So the well that is changing it's state of matter should be the one undergoing a chemical change. For, example boiling or freezing
Answer:
Soil getting dug up by moles.
Sunlight - it is the only thing that is not living in the list.
D. As salt water in the oceans.
