Question

In a petroleum well, crude oil is found over water. Which two properties of petroleum make it possible to form a layer of it above water

Answer 1

this becoz petroleum is lighter than water hence it floats over it mske a layer above the water
presence of hydro carbons in the electric mix make the peyroleum substance quite light in comparison to water

Answer 2

Petroleum occurs deep inside the earth floating over water. It forms a seperate layer over water because of its two property-

1st. Its density is less than water

2nd. It is insoluble