Final answer:
Coal exists on the continent of Antarctica due to the fossilization of prehistoric plants. These plants transformed into coal over time through heat and pressure. Some coal deposits in Antarctica have less sulfur due to their formation in freshwater swamps.
Step-by-step explanation:
Coal exists on the continent of Antarctica due to its formation from the remains of plants that lived hundreds of millions of years ago. These plants, such as trees and ferns, were buried and underwent a process called fossilization. Over time, heat and pressure transformed the organic material into coal. Some coal deposits in Antarctica were formed in freshwater swamps and have less sulfur compared to deposits formed in areas with sea water.