Total types of coal are

Explanation

To answer the question about the total types of coal, we can break down the information into clear steps:

### Step-by-Step Solution:

1. **Identify the Types of Coal**: There are four main types of coal that are commonly recognized.

2. **First Type - Peat**:
- Peat is the initial stage of coal formation. It consists of partially decomposed plant material and is brownish in color.

3. **Second Type - Lignite**:
- Lignite, also known as brown coal, is formed from peat when subjected to increased heat and pressure. It has a higher carbon content than peat.

4. **Third Type - Bituminous Coal**:
- Bituminous coal is formed from lignite under further heat and pressure. It contains about 80% carbon and is often referred to as soft coal.

5. **Fourth Type - Anthracite**:
- Anthracite is the hardest form of coal and is formed from bituminous coal under even higher heat and pressure conditions. It has the highest carbon content and is known for its high energy content.

### Summary of the Types of Coal:
- Peat
- Lignite (Brown Coal)
- Bituminous Coal (Soft Coal)
- Anthracite (Hard Coal)