Smooth oval hills composed mainly of boulders or glacial sands and gravels are known as
Answer Details
Smooth oval hills composed mainly of boulders or glacial sands and gravels are known as drumlins.
Drumlins are glacial landforms that are typically elongated in shape and have a smooth, streamlined appearance. They are formed by the movement of glaciers over the land, which causes the sediment and debris at the base of the glacier to be reshaped and reworked into a teardrop or spoon-like shape with a long axis parallel to the direction of ice flow.
Drumlins can be composed of various materials, including boulders, glacial sands, and gravels, which are often mixed together in a chaotic manner. They are typically found in groups or swarms, which can be oriented in different directions depending on the direction of the ice flow.
Other glacial landforms that are often associated with drumlins include eskers (long, winding ridges of sand and gravel deposited by meltwater streams), moraines (ridges of glacial debris deposited at the edges of glaciers), aretes (narrow, sharp ridges that form between two glacial valleys), and pyramidal peaks (sharp, pointed mountains formed by the erosive action of glaciers). However, drumlins are distinguished by their characteristic smooth, elongated shape and composition of boulders and glacial sands and gravels.