Board Thread:Speculation House/@comment-6490434-20130410061505/@comment-4010415-20150416055521

Alternatively... it'd be interesting if the core of Remnant is molten Dust. The molten Dust gets pushed to the surface through various means, such as through volcanic activity, and the Dust that's brought to the surface eventually gets buried after more and more earth gets piled up on top of it. Similar elements in the molten Dust collect together to form the four colors. Fire to fire, ice to ice, lightning to lightning, wind to wind.