washboard moraine मीनिंग इन हिंदी

The archipelago is unique in that it features ridged washboard moraines known as De Geer moraines, formed by the melting of the continental ice sheet 10, 000 to 24, 000 years ago.
Crevasse fields of similar geometry to fields of washboard moraines have been observed on ice shelves of Antarctica experiencing large amounts of longitudinal extension, similar to the stresses that would have been experienced by the glaciers that formed these moraines.