Question
Name the types of coal and give the differences in them.
| Points of differences | Peat | Lignite | Bitumi-nous | Anthracite |
| (1)Formation step number | First | Second | Third | Last |
| (2)Carbon content | Lessthan60% | 60%to70% | 70%to90% | about95% |
| (3)Heat produced | Lowest of all the rest | More than peat but less than bituminous | More than lignite but less than anthracite | Highest of all the rest |
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