1 1 gram of SO 2 for every million mL of air (parts per million by mass per volume). 2  Write ppm in terms of cubic meters. 3  There are a million cubic centimeters in a cubic meter (1 cm 3 = (10 -2) 3 m 3 = 10 -6 m 3) so one part per million of SO 2 by volume in air is actually 1 cm 3 SO 2 / 1 m 3 of air. 1 gram of SO 2 for every million grams of air (parts per million by mass); 2  1 mL of SO 2 for every million mL of air (parts per million by volume); 3  1 gram of SO 2 for every million mL of air (parts per million by mass per volume). 4  Write ppm in terms of cubic meters.
EXPERT ANSWER. Coal if formed when dead animals and plants got buried inside the layer of Earth. The layers increase form time to time and more dead plants and animals get buried in the layers.Therefore, coal is found in layers.For example, let us consider the layers of sandwich, on the first bread we apply the toppings and cover it another slice. Then some more topping is added to second slice and is covered by third slide.XPERT ANSWER. Coal if formed when dead animals and plants got buried inside the layer of Earth. The layers increase form time to time and more dead plants and animals get buried in the layers.
The Coal measures are a major source of Paleozoic plant fossils, with many groups of plants in existence at this time. The spoil heaps of coal mines are the best places to collect; coal itself is the remains of fossilised plants, though structural detail of the plant fossils is rarely visible in coal.