Oil is a very expensive resource because : It is very useful It is a non-renewable resource

. Oil comes from numerous mineral, vegetable, and synthetic substances and animal and vegetable fats that are generally slippery, combustible, viscous, liquid, soluble in various organic solvents such as ether but not in water.

Oil was formed from the remains of animals and plants that lived millions of years ago in a marine environment before the dinosaurs. Over the years, the remains were covered by layers of mud. Heat and pressure from these layers helped the remains turn into what we today call crude oil . The word "petroleum" means "rock oil" or "oil from the earth."

Oil is a very expensive resource because : It is very useful It is a non-renewable resource It is highly pollutant

HYPOTHESIS If oil seems to be so important and useful, then how can it change the Earth ? Let’s see our experiment :

Materials: Cookingoil A plastic glass Water

FIRST pour water in the glass NEXT add cooking oil to the glass with water

As you can see, the cooking oil stays on the surface of the water forming a thick layer

RESULTS We waited for a while to see bubbles because water has oxygen, but the bubbles never appeared.

CONCLUSION The bubbles of oxygen in the water didn’t appear, so it means that there was no oxygen there. The layer of oil took the oxygen away and if there is not oxygen, there can’t be life. When this happens, the hydrosphere is changed in a negative way because ecosystems are lost.

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Oil is a very expensive resource because : It is very useful It is a non-renewable resource