00293    a2200097   4500020001500000082001300015245007700028260004000105300001600145650003400161  a0335163394  a551bOPE  aEarth materials and processes an introduction to the rock cyclebunit 27  aLondonbOpen universityc1994g1994  a94p.c30cm.  aGEOLOGY HYDROLOGY METEOROLOGY