The formation of oil

Question 1

Oil forms from the remains of tiny sea creatures called plankton which settle in ….. on the sea bed

Answer 1

mud

Question 2

If oxygen isn’t present the plankton remains and doesn’t ……..

Answer 2

decompose

Question 3

Natural gas is mainly hydrocarbon methane why is it found near deposits

Answer 3

Natural gas is formed from plankton in a similar way to oil. This means that we often find
natural gas near oil deposits