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.  .
Picasso's Blue Period (1901â1904), characterized by somber paintings rendered in shades of blue and blue-green, only occasionally warmed by other colors, began either in Spain in early 1901, or in Paris in the second half of the year.