Coal and Petroleum 8 Science — Revision Notes
Coal and petroleum are fossil fuels formed from the remains of ancient plants and organisms buried under pressure for millions of years. They are crucial e
TL;DR: Coal and petroleum are fossil fuels formed from the remains of ancient plants and organisms buried under pressure for millions of years. They are cruc…
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Coal and petroleum are fossil fuels formed from the remains of ancient plants and organisms buried under pressure for millions of years. They are crucial e
Key Points to Remember
- Coal is a black mineral formed from fossilized plant remains buried deep underground over millions of years
- Coal forms through the process of carbonization when plant material is compressed and heated
- Petroleum or crude oil is a dark, viscous liquid mixture of hydrocarbons formed from ancient marine organisms
- Coal is mined from mines using open-pit or underground mining methods
- Petroleum is extracted by drilling wells deep into the Earth where oil reservoirs are located
- Refining processes separate crude oil into useful products like petrol, diesel, kerosene, and lubricating oil
- Fractional distillation uses different boiling points to separate crude oil components by molecular size
- Coal is used as a fuel for electricity generation, heating, and in steel production
- Petroleum products power vehicles, heat buildings, and serve as raw materials for plastics and chemicals
- Burning fossil fuels releases carbon dioxide, contributing to climate change and air pollution
- Coal reserves are rapidly depleting due to continuous mining and high global demand
- Renewable energy sources like solar, wind, and hydroelectric power are alternatives to fossil fuels
Key Terms
- Fossil Fuel: Non-renewable energy source formed from the fossilized remains of ancient plants and organisms
- Carbonization: Process of conversion of buried plant matter into coal through heat, pressure, and time over millions of years
- Crude Oil: Naturally occurring petroleum, a mixture of liquid hydrocarbons extracted from underground reservoirs
- Refining: Process of separating crude oil into useful products through distillation and chemical treatment
- Fractional Distillation: Separation technique that exploits different boiling points of hydrocarbons in crude oil to obtain various products
- Non-renewable: Resource that cannot be naturally replenished at the rate it is consumed, like fossil fuels
Frequently Asked Questions
How were coal and petroleum formed?
Coal formed from buried plant remains subjected to heat and pressure over millions of years. Petroleum formed from marine organisms and plankton buried in sediments and transformed by heat and pressure
What is fractional distillation?
Fractional distillation separates crude oil into different products by heating it and cooling at different levels in a fractionating column, where molecules with low boiling points rise higher
Why are coal and petroleum non-renewable?
Coal and petroleum take millions of years to form from ancient organisms, but are consumed at rates far exceeding their natural formation, making them non-renewable on human timescales
More 8 Science Revision Notes
- Crop Production and Management
- Microorganisms: Friend and Foe
- Cell: Structure and Functions
- Reproduction in Animals
- Force and Pressure
- Sound
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