There are 12 pairs of curved bones called X in our chest region. One end of bones X is joined to
backbone and their other end is joined to bone Y in
front to form a box-like structure Z. This strong box
like structure protects the delicate internal organs P and
Q.

What are X, Y and Z?
Name the organs P and Q

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Air pollution from coal mines is mainly due to emissions of particulate matter and gases including methane (CH4), sulfur dioxide (SO2), and nitrogen oxides (NOx), as well as carbon monoxide (CO).

There are numerous damaging environmental impacts of coal that occur through its mining, preparation, combustion, waste storage, and transport. Hope this helps!!!