Ground-up shells of marine organisms mixed with pebbles, clay and eroded rock, deposited there over many millennia, now form a bed of muddy paste that is so soft and well lubricated that the ice streams can glide along even more easily than earlier resear
Ground-up shells of marine organisms mixed with pebbles, clay and eroded rock, deposited there over many millennia, now form a bed of muddy paste that is so soft and well lubricated that the ice streams can glide along even more easily than earlier resear
有科学家将积冰融化出一公里长的窄洞，采集古老海床的样本，结果发现地底混杂了海洋生物壳体、砾石、黏土与风化岩，几千年下来形成又软又滑的泥床，使冰流较先前研究人员预期的更容易滑动。