Fill in the following blanks with suitable words:
c) The slow process of conversion of dead vegetation into coal is called ………

Explanation

To fill in the blank for the statement "The slow process of conversion of dead vegetation into coal is called ………", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Process**: The question asks about the conversion of dead vegetation into coal. This process occurs over millions of years under specific conditions.

2. **Identifying the Conditions**: The dead vegetation, which includes plants and trees that have died, gets buried under layers of soil. Over time, this burial leads to an increase in temperature and pressure.

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