Answer: Oil does not mix with seawater because oil and water have different densities and do not mix due to differences in their molecular structures.
Explanation: Oil is less dense than water, so it rises to the surface of the water and forms a layer on top. The oil forms globules or droplets that are surrounded by a thin layer of water, but they do not mix together because oil is composed of hydrophobic molecules that do not dissolve in water. The hydrophobic nature of oil allows it to float on the surface of the water, which makes it easier to contain and clean up in the event of an oil spill. However, this also means that the oil can spread over a large area and cause damage to the marine environment and wildlife.