Coal and Petroleum – Comprehensive Study Notes

Page 1 – Classification of Natural Resources, Availability & Daily-Life Context

Key Questions Posed

• Can air, water and soil be exhausted by human activities?
• Is water really a limitless resource?
• Can we keep using all our natural resources forever?

Broad Classification

1. Inexhaustible (Renewable) Natural Resources
   – Present in unlimited quantity; cannot be depleted by humans.
   – Examples: sunlight, air.
2. Exhaustible (Non-renewable) Natural Resources
   – Limited in amount; can be exhausted by over-use.
   – Examples: forests, wildlife, minerals, coal, petroleum, natural gas.

Classroom Activities

Activity 3.1 – Sorting Daily-Use Materials
Students list objects they use every day and tag each as Natural or Man-made (e.g., water, plastic bottle, cotton shirt, steel spoon).

Conceptual Take-aways

• Resources obtained directly from nature are called natural resources.
• Even apparently abundant resources may have practical limits if consumption outpaces natural replenishment.

Page 2 – Simulation of Resource Depletion & Introduction to Fossil Fuels

Activity 3.2 – “Generation Jar” Experiment

• Setup: Each group of $7$ learners gets one container filled with popcorn/peanuts etc.
  • Sub-divide into 1-member First Generation, 2-member Second Generation, and 4-member Third Generation.
• Process: Each sub-group removes snacks in turn, symbolising sequential generations using an exhaustible resource.
• Observation Points
  • Does the third generation receive anything?
  • Did earlier generations act greedily or prudently?
• Metaphor: The eatables = total stock of an exhaustible resource such as coal, petroleum or natural gas.
  Different removal patterns model different societal consumption behaviours.

Definition & Origin of Fossil Fuels

• Coal, petroleum and natural gas are termed fossil fuels because they were produced from the dead remains of once-living organisms (plants or marine life) over geological time-scales.

Page 3 – Coal: Formation, Products & Uses

Physical Appearance & Historical Use

• Coal is black, hard, stone-like (Fig 3.1).
• Formerly powered steam locomotives; still fuels thermal power plants and many industries; occasionally used domestically for cooking.

Geological Story (Carbonisation)

1. About $300\,\text{million years}$ ago, Earth hosted dense, swampy forests.
2. Natural events (e.g.
   flooding) buried the vegetation under layers of soil.
3. Progressive compression + rising temperature converted plant matter into coal.

The slow conversion of plant debris to almost-pure carbon is called carbonisation.

Major Coal Products & Their Characteristics

Note: Modern road construction often uses bitumen (a petroleum product) instead of coal tar.

Page 4 – Petroleum: Formation, Extraction & Layer Structure

Everyday Fuels

• Petrol powers light vehicles (cars, motorcycles).
• Diesel powers heavy vehicles (trucks, tractors) and generators.

Geological Formation

1. Marine organisms died and settled on the sea-floor.
2. Covered by layers of sand & clay 7 sealed from air.
3. Over $\text{millions of years}$, high pressure + high temperature + anaerobic conditions transformed remains into petroleum & natural gas.

Stratification in Reservoirs (Fig 3.4)

• From top to bottom: Gas → Oil → Water; oil/gas sit above water because they are lighter and immiscible.

Historical & Geographical Facts

• First oil well: Pennsylvania, USA ( $1859$ ).
• First Indian strike: Makum, Assam ( $1867$ ).
• Indian petroleum locations: Assam, Gujarat, Mumbai High, Krishna–Godavari & Godavari basins.

Page 5 – Refining, Petrochemicals & Natural Gas

Refining of Petroleum

• Petroleum is a dark, oily liquid with unpleasant odour comprising many hydrocarbons.
• Refining = fractional separation performed in a petroleum refinery (Fig 3.5).

Main Fractions & Uses (Table 3.1)

Petrochemicals (derived from petroleum/natural gas) feed production of detergents, synthetic fibres (polyester, nylon, acrylic), polythene & other plastics.

Because of its economic value, petroleum is nick-named “black gold.”

Natural Gas & CNG

• Natural gas is favoured because it can be piped directly and is relatively clean.
• Compressed Natural Gas (CNG) is stored under high pressure; adopted for power generation and transport vehicles (e.g., Delhi, Vadodara networks).
• Also serves as feed-stock for fertilisers (e.g., urea via $\text{H}_2$ from gas).

Indian Reserves

Found in: Tripura, Rajasthan, Maharashtra, Krishna–Godavari delta.

Page 6 – Finite Nature of Fossil Fuels & Conservation Imperatives

Why Are They Limited?

• Formation takes millions of years; current reserves will last only a few hundred years at existing consumption rates.
• Burning fossil fuels causes air pollution and contributes to global warming.

Conservation Guidance (PCRA Recommendations)

1. Maintain constant, moderate driving speed.
2. Switch off engine at traffic lights or prolonged halts.
3. Keep tyre pressure correct.
4. Ensure regular vehicle maintenance.

Laboratory Synthesis?

• Creating coal, petroleum or natural gas in a lab is not feasible; geological conditions and time-scales cannot be replicated.

Page 7 – Key Vocabulary & Summary of Concepts

Essential Terms

• Coal, Coke, Coal Gas, Coal Tar, Petroleum, Natural Gas, Petroleum Refinery, Fossil Fuel.

What You Have Learnt

• Coal, petroleum, natural gas = fossil fuels, hence exhaustible.
• Coal yields coke, coal tar, coal gas.
• Petroleum refining produces LPG, petrol, kerosene, diesel, lubricating oil, paraffin wax, bitumen.
• Prudent use extends resource life & mitigates environmental damage.

Comparative Environmental Advantage

• CNG/LPG burn more cleanly than petrol or diesel → lower particulate and $\text{SO}_2$ emissions.

Page 8 – Numerical Data & Extension Projects

National Power Shortage Statistics (1991–1997)

Year-wise percentage shortage:
\begin{array}{|c|c|}\hline \text{Year} & \text{Shortage (\%)} \ \hline 1991 & 7.9 \ 1992 & 7.8 \ 1993 & 8.3 \ 1994 & 7.4 \ 1995 & 7.1 \ 1996 & 9.2 \ 1997 & 11.5 \ \hline\end{array}
(Students are expected to graph these values: X-axis = Year, Y-axis = % Shortage.)

Suggested Investigations

1. Map Indian sites of coal, petroleum & natural-gas deposits; mark refineries.
2. Survey neighbouring households: Track five-year trends in their consumption of coal, LPG, electricity, petrol, kerosene & list conservation steps taken.
3. Research the locations of major thermal power plants and explain siting factors (coal proximity, water availability, grid access, etc.).

Useful Online Resources

• http://www.energyarchive.ca.gov
• http://web.ccsd.k12.wy.us
• http://web.pcra.org

Consolidated Practical Insights

• The “Generation Jar” demonstrates how individual consumption choices affect long-term resource availability.
• Bitumen vs Coal Tar: Shift driven by performance & toxicity considerations.
• Black Gold Paradox: High economic value vs ecological cost → underscores need for sustainable alternatives.
• CNG Infrastructure: Pipeline networks enable household, industrial & transport usage, but require substantial upfront investment.

Ethical & Societal Dimensions

• Inter-generational equity: current consumers bear moral responsibility to leave sufficient resources for future populations.
• Pollution externalities: environmental costs often under-priced, necessitating policy interventions (taxes, subsidies, regulations).
• Energy access disparity: remote areas may still rely on traditional biomass; highlights dual goal of expanding clean energy access while curbing over-consumption elsewhere.