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.  .
Picassoâs painting is based on the events of April 27, 1937, when Hitlerâs powerful German air force, acting in support of Franco, bombed the village of Guernica in northern Spain, a city of no strategic military value.