Question

What is fossil fuel? Write with example.

Hint:

Fossil fuels are non-renewable — once exhausted, they cannot be quickly replenished.

Answer 1

Step 1: Definition
Fossil fuels are natural fuels that are formed from the remains of dead plants and animals buried deep inside the Earth for millions of years. Due to high pressure and temperature, these remains are converted into carbon-rich substances.

Step 2: Types of Fossil Fuels
Coal: Solid fossil fuel mainly made of carbon.
Petroleum: Liquid fossil fuel, also called crude oil, refined into petrol, diesel, kerosene.
Natural Gas: Gaseous fossil fuel consisting mainly of methane ($CH_4$).
Step 3: Examples
Coal used in thermal power plants.
Petrol and diesel used in vehicles.
CNG (Compressed Natural Gas) used in buses and cars.
Step 4: Importance
Fossil fuels are the primary source of energy for industries, transport, and electricity production. However, their overuse causes pollution and global warming.
Final Answer:
Fossil fuels are energy-rich substances formed from dead organisms over millions of years. Examples: coal, petroleum, natural gas.