Stratified serpentine-shaped deposits are known as?

• A. Moraine
• B. Bowen's Series
• C. Drumlins
• D. Eskers

Answer: (D)

Long, winding ridges of layered sands and gravels deposited by meltwater flowing in channels beneath or within a glacier are eskers. As subglacial streams carried sediment, they laid down sorted, laminates of sand and gravel in the tunnels that followed the glacier’s contours. When the ice melted, these sediment-filled channels were left as sinuous ridges that trace the former flow paths, giving eskers their characteristic serpentine shape and stratified composition.

This distinguishes eskers from moraines, which are piles of mixed, unsorted debris deposited at the glacier’s ends or margins; drumlins, which are streamlined hills built from till by glacial flow and are not typically layered; and Bowen's Series, which is a concept about mineral crystallization in igneous systems and not a glacial depositional feature.