由于雨水的不断的溶解，使原始的岩石或沉积物发生破裂，从而形成各种大小的砾块或砾石。
Because of continuous dissolution on former lithified sediments or rocks, these sediments or rocks will be broken into various sizes of clasts and pebbles.
每次冰期及间冰期沉积物中的砾石及其岩性，砾态，沉积厚度，风化程度等都有明显区别。
The gravels in deposits of different glacial epochs and interglacial stages show obviously different rock characteristics, gravel forms, deposit thicknesses and weathering degrees.
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