Describe how coal is formed from dead vegetation. What is this process called?

Explanation

### Step-by-Step Solution

1. **Understanding the Origin**: Coal is formed from the remains of dead vegetation, primarily from dense forests that existed around 300 million years ago.

**Hint**: Think about the types of environments where large amounts of plant life could accumulate.

2. **Natural Calamities**: These dense forests were affected by natural calamities such as floods or tsunamis, which led to the death of the trees and plants.

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