___________contains about 70-90% coal. It is also known as black lignite. It is used for power generation.

Options

A. Peat
B. Bituminous
C. Lignite
D. Anthracite

Answer

To solve the question, we need to identify the type of coal that contains about 70-90% coal, is also known as black lignite, and is used for power generation.

### Step-by-Step Solution:

1. **Understanding Coal Types**:
- There are different types of coal based on their carbon content and properties. The main types include lignite, bituminous, sub-bituminous, and anthracite.

2. **Identifying the Carbon Content**:
- Lignite contains about 60% carbon.
- Bituminous coal contains about 70-86% carbon.
- Sub-bituminous coal has a carbon content between lignite and bituminous.
- Anthracite has the highest carbon content, about 80-92%.

3. **Matching the Description**:
- The question states that the coal contains about 70-90% coal and is known as black lignite.
- Based on the carbon content, bituminous coal fits this description as it has a carbon content of 70-86%.

4. **Conclusion**:
- Therefore, the answer to the question is **Bituminous coal**.

### Final Answer:
Bituminous coal contains about 70-90% coal. It is also known as black lignite and is used for power generation.

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