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Fossil Fuel Formation:
What Are Fossil Fuels?
Fossil fuels are non-renewable energy sources: coal, oil, and natural gas.
Formed from remains of living organisms (plants and animals) buried millions of years ago.
Burning fossil fuels releases carbon dioxide (CO₂) into the atmosphere, contributing to global warming and air pollution.
Composition
Made of hydrocarbons (compounds of hydrogen and carbon).
Originated when ancient flora and fauna (plants and animals) decomposed under mud, rock, and sand layers.
Over millions of years, heat and pressure converted these remains into fossil fuels.
Formation of Coal:
Process:
Source material: Dead trees, ferns, and plants from the Carboniferous period (≈300–400 million years ago).
Environment: Warm, swampy areas with abundant vegetation.
Burial: Plant matter accumulated → buried under mud and sand.
Decomposition: Bacteria partially decomposed organic matter → peat.
Compression: Over time, pressure and heat transformed peat into coal.
Dead plants/animals → mud/sand → heat → pressure → coal.
Formation of Oil and Natural Gas:
Process:
Source material: Microscopic marine organisms (plankton) and algae.
Burial: After death, they settled on sea floors → buried under sediment.
Decomposition: Lack of oxygen prevented full decay → organic matter preserved.
Transformation: Over millions of years, heat and pressure converted organic matter into crude oil and natural gas.
Migration: Oil and gas moved upward through porous rocks until trapped under impermeable rock layers.
Marine organisms → sediment → heat/pressure → oil/gas.
Energy Resources and Generation of Electricity
Energy Basics
Energy powers everything — from heating homes to running industries.
Global population growth and economic development increase energy demand yearly.
Energy is used for heating, transport, and electricity generation.
Thermal Power Generation
Most electricity is produced by thermal power stations.
Fuel (coal, oil, gas, etc.) is burned to produce heat, turning water into steam.
Steam drives turbines, which rotate generators to produce electricity.
Fuel → heat → steam → turbine → generator.
Types of Energy Resources
Energy Security
Countries with abundant energy sources and technology are energy secure.
Energy security means reliable access to affordable energy.
Renewable Energy Sources
Solar Power
Converts sunlight into electricity using solar panels.
Works best in sunny climates.
Advantages: Clean, renewable, low maintenance.
Disadvantages: Expensive setup, depends on sunlight.
Wind Power
Uses wind turbines to generate electricity.
Advantages: No pollution, renewable.
Disadvantages: Variable wind speeds, visual/noise impact.
Hydroelectric Power
Water stored in dams flows through turbines.
Advantages: Reliable, renewable, can store energy.
Disadvantages: Floods land, affects ecosystems.
Tidal and Wave Power
Tidal: Uses movement of tides.
Wave: Uses surface waves.
Advantages: Predictable, renewable.
Disadvantages: Expensive, limited locations.
Biofuels
Made from organic matter (plants, waste).
Examples: Bioethanol, biogas, wood.
Advantages: Renewable, reduces waste.
Disadvantages: Competes with food crops, land use.
Geothermal Power
Uses heat from Earth’s interior.
Advantages: Reliable, clean.
Disadvantages: Limited to volcanic regions.
Non-Renewable Energy Sources
Fossil Fuels (Coal, Oil, Natural Gas)
Formed from ancient organic matter under heat and pressure.
Advantages: High energy output, established technology.
Disadvantages: Non-renewable, pollution, greenhouse gases.
Nuclear Power
Uses uranium in nuclear fission to release energy.
Advantages: High output, low CO₂ emissions.
Disadvantages: Radioactive waste, high cost, safety risks.
Environmental Impacts
Electricity Generation and Distribution
Power Stations
Convert energy sources into electricity.
Electricity transmitted via pylons and cables to homes and industries.
Efficiency
Energy efficiency = useful energy output ÷ total energy input.
Improving efficiency reduces waste and emissions.
Energy Demand
Definition
Energy demand = the amount of energy required by people and industries for daily activities.
It varies by country, wealth, population, and climate.
Types of Energy Demand
Factors Affecting Energy Demand
Population growth: more people → higher demand.
Economic development: richer countries use more energy.
Climate: cold countries need heating; hot ones need cooling.
Technology: advanced societies use more electrical devices.
Lifestyle: urban living increases electricity use.
Energy and Wealth
National Wealth
Wealthier nations have higher per capita energy use.
They can afford advanced technology and diverse energy sources.
Poorer nations rely on traditional fuels (wood, charcoal).
Relationship Between Energy and Development
Energy availability supports industry, transport, and education.
Lack of energy limits economic growth and quality of life.
Energy use vs GDP graph: richer countries consume more energy.
Climate and Energy Use
Influence of Climate
Cold climates → high energy for heating.
Hot climates → high energy for cooling (air conditioning).
Seasonal variation affects electricity demand.
Renewable Energy and Climate
Solar power works best in sunny regions.
Wind power depends on wind patterns.
Hydroelectric power depends on rainfall and rivers.
NOTES DONE BY FARIDA SABET
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