How is oil formed?
Kuvakäsikirjoitus Teksti
- The sun provides energy to microscopic plants floating in the ocean, which are later eaten by marine animals.
- These die, fall into the bottom of a saltwater marine environment and get buried under (higher pressures and higher temperatures) sediment (sand and silt).
- The remains were buried deeper and deeper over centuries, and were impacted due to heat and pressure. 
- The fossils begin to slowly get trapped under many layers of rock.
- The immense heat and pressure transformed the smoldering remains into oil and gas. Oil rises through permeable rock, but when it reaches impermeable rock, it forms reservoirs.
- Gradually, over millions of years, their delicate parts begin converting into oil and we then extract it from the seas and convert part of it into petrol.
Yli 30 miljoonaa kuvakäsikirjoitusta luotu