Glaciers may form in permanently cold areas, and these slowly moving masses of ice cut out valleys, carrying with them huge quantities of eroded rock debris.
冰川可能形成于长期寒冷的地区，而这些缓慢移动的冰块切割了山谷，带走了大量被侵蚀的岩石碎片。
2
Comets lose ice and dust each time they come near the sun, leaving behind trails of debris.
彗星每次接近太阳时，都会将一部分冰和尘埃遗留在彗尾的遗迹中。
3
The buried ice was spotted in debris thrown up in five recent northern hemisphere impact craters.