Choose the sequence that best summarises how different types of coal are formed during the carbonisation process

Options

A. Peat`to` anthracite`to` bituminous coal`to` lignite
B. Peat`to` lignite`to` bituminous coal`to` anthracite
C. Lignite`to` peat`to` anthrcite`to` bituminous coal
D. Lignite`to` bituminous coal`to` peat `to` anthracite

Answer

To summarize how different types of coal are formed during the carbonization process, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Carbonization**: Carbonization is the process of converting organic material into carbon or carbon-containing residues through heating in the absence of air. This process occurs over millions of years and leads to the formation of different types of coal.

2. **Identifying the Types of Coal**: The four main types of coal formed during carbonization are:
- **Peat**: This is the initial stage of coal formation, consisting of decomposed plant material.
- **Lignite**: This is the second stage, where peat is subjected to heat and pressure, resulting in a soft brown coal.
- **Bituminous Coal**: This is the third stage, where lignite undergoes further heat and pressure, resulting in a denser and harder type of coal.
- **Anthracite**: This is the final stage, where bituminous coal is subjected to even more heat and pressure, resulting in a high carbon content and a shiny appearance.

3. **Sequence of Formation**: The sequence of coal formation during the carbonization process is as follows:
- First, **Peat** forms.
- After some time, **Lignite** is formed from peat.
- Next, **Bituminous Coal** is formed from lignite.
- Finally, **Anthracite** is formed from bituminous coal.

4. **Final Sequence**: Therefore, the correct sequence summarizing how different types of coal are formed during the carbonization process is:
- **Peat → Lignite → Bituminous Coal → Anthracite**.

### Answer:
The best sequence that summarizes how different types of coal are formed during the carbonization process is:
**Peat → Lignite → Bituminous Coal → Anthracite**.