Video Lecture 1: A 300-Million-Year Journey — The Genesis of Coal and Carbonisation

# Video Lecture 1: A 300-Million-Year Journey — The Genesis of Coal and Carbonisation
**Instructor:** Dr. Ananya Sharma | **Duration:** ~05:40 mins

### Introduction: Natural Resources & Scarcity
Nature provides human civilization with an array of raw materials, which we categorize into:
1. **Inexhaustible Natural Resources:** Available in virtually unlimited quantities and cannot be depleted by human consumption (e.g., sunlight, air).
2. **Exhaustible Natural Resources:** Available in strictly limited finite reserves and will be completely exhausted if overexploited (e.g., forests, wildlife, minerals, coal, petroleum, natural gas).

### What are Fossil Fuels?
Coal, petroleum, and natural gas were synthesized from the dead biological remains of plants and marine organisms over millions of years. Hence, they are universally termed **Fossil Fuels**.

### The Epoch of Coal Formation: Carbonisation
About 300 million years ago (during the Carboniferous geological epoch), the Earth possessed dense, sprawling swamp forests in low-lying wetland basins.
- Cataclysmic flooding, volcanic deposits, and tectonic activity submerged these forests under deep layers of mud and silt.
- As more and more sedimentary sediment deposited above them, they were subjected to intense compression.
- Under conditions of extreme subterranean pressure, scorching geothermal temperatures, and total absence of atmospheric oxygen, the dead vegetable matter was gradually converted into coal.
This slow, geological transformation of dead vegetation into coal is scientifically termed **Carbonisation**. Because coal is rich in carbon, burning it releases energy alongside carbon dioxide.