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.  .
Incidents in Picassoâs private life and the political events afflicting Europe between the wars fused together in the motifs the painter was using at the time, resulting both in Guernica itself and all the studies and âpostscriptsâ, regarded as among the most representative works of art of the 20 th century.