Eskers are very long ridges apparently formed when sub-glacial streams or rivers deposited sedimentary materials . 蛇形丘顯然是冰下河溪的沉積物堆積而成的很長的壟崗。
This course covers sediments in the rock cycle , production of sediments at the earth ' s surface , physics and chemistry of sedimentary materials , and scale and geometry of near - surface sedimentary bodies , including aquifers 本課程涉及到巖石循環(huán)中的沉積物,在地球表面沉積物的產生,沉積物的物理和化學性質,和近地表沉積體的規(guī)模和形狀,包括含水層。