What are the four primary elements found in coal? 90% carbon, 3% oxygen, 4% hydrogen, and 1% sulfur. What forms of air pollution do these elements become as part of coal combustion? When coal is burned for fuel, it combines with oxygen in air to form several air pollutions. What substances are contained within coal ash?
It is an oil painting on canvas.   It is to show Picasso's anger at the bombing of the little Spanish town Guernica in 1937.  .
This painting can be seen in the Museo Reina Sofia in Madrid. Interpretations of Guernica vary widely and contradict one another. This extends, for example, to the mural's two dominant elements: the bull and the horse.