What are the structures that form when oil doesn’t mix with sea water

The word I believe you are looking for is, 'immiscible'.

Which is when oil and water don't mix.

For example crude oil floats in the sea after a spill from a tanker.

Explanation:

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.