Answer:

1) The common in those four pictures is they all used coal

2) Coal is important because it use in many ways like selling it, operating old trains before and making us warm during winter

Answer:

1. It represents the coal mining and coal power plantation.

2.this is all about our nature concerns, and also to everyone to be aware what really effects to our nature in using coal that can possibly causes to Disruption of our trees can also cause to other destruction of our nature.