Which fuel was formed from the remains of organisms that lived in the sea?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Petroleum
Petroleum was formed from organisms that lived in the sea. When they died, their bodies settled at the sea bed and were covered with layers of sand and clay; over millions of years, high pressure and temperature, without air, turned them into petroleum and natural gas.
Why the other options are incorrect
Option (2) Electricity — Incorrect. Electricity is a form of energy produced in power plants, not a fuel formed in nature.
Option (3) Biogas — Incorrect. Biogas is made today from cow dung and plant waste broken down by bacteria without air.
Option (4) Coal — Incorrect. Coal was formed from dense forests of land plants buried under the Earth.