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The source of sulfur in coal is from all of the following except
Glacier
A large, slow-moving mass of ice, formed from compacted snow and slowly flows over land.
Ice
Frozen water, existing in various forms in nature, including snow, glacial ice, and sea ice, playing a critical role in Earth's climate system.
Dense
Having a high degree of compactness or mass per unit volume.
U-Shaped Valley
A U-shaped valley is a type of valley characterized by its U-shaped cross-section, typically formed by the erosion caused by glaciers.
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