Sound would travel in a thick piece of medal (high density) because sound travels best through solids. Therefore, the thicker, the easier sound can travel.
(I know for sure that sound travels best through solids but if the rest is wrong than I am sorry, though I don't think it is)
Sound would travel faster in a thick piece of metal since the molecules are closer together. However, since there are more molecules, it would be quieter on the other side than the hollow metal.
Soil can become waterlogged. The water can cut off the air supply to the roots and to the organisms that live in the soil. If the roots do not receive enough oxygen, the plants will die because they rely on oxygen to complete photosynthesis.
