Gas and crude oil hydrocarbons climb into oil traps because they are somewhat buoyant and float above groundwater because they are less dense than water. Option (c) is correct.
Although it can also be yellowish, reddish, tan, or even greenish, crude oil is often black or dark brown in color. The unique chemical compositions of various crude oil suppliers are indicated by color variations. Lighter petroleum often has lower metal or sulfur content (sometimes nearly clear). However, petroleum is a non-renewable energy source, just like coal and natural gas.
When it is taken and consumed, there is no way for us to recreate it because it took millions of years to form. Ground water is liquid that exists below in saturated areas below the surface of the earth. Contrary to common perception, underground "rivers" are not formed by ground water. Sand, gravel, and other subsurface sediments, as well as fractures and pores in underground rock, are filled.
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