TY  - BOOK
AU  - Lapidus, Dorothy Farris
TI  - The facts on file: dictionary of geology and geophysics 
SN  - 871967030
AV  - QE 5 .L37 1987 
PY  - 1987///
CY  - New York
PB  - Facts On File Publications
KW  - HISTORICAL GEOLOGY
N2  - The concept of sea-floor spreading, the constant generation of new sea floor, offered a reason for why oceanic crust is younger than continental crust
ER  -