The New Encyclopædia Britannica, Volume 16Encyclopaedia Britannica, 1981 - Encyclopedias and dictionaries |
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Page 46
... deposits of minerals that are not considered either ores or reserves today may become so if the technology for their extraction improves , if the supplies of energy available for their extraction in- creases , or if their economic value ...
... deposits of minerals that are not considered either ores or reserves today may become so if the technology for their extraction improves , if the supplies of energy available for their extraction in- creases , or if their economic value ...
Page 117
... deposits are en- countered mainly in low latitudes , especially around cor- al reefs . Off formerly glaciated coasts , gravel and boul- ders are common . Most beaches are bare rock , cobbles , or sand , although in protected sites mud ...
... deposits are en- countered mainly in low latitudes , especially around cor- al reefs . Off formerly glaciated coasts , gravel and boul- ders are common . Most beaches are bare rock , cobbles , or sand , although in protected sites mud ...
Page 611
... deposit will be virtually indistinguishable from other channel deposits . Another fluvial process that is characteristic of arid re- gions is piping - a subsurface sapping of unconsolidated sediments that may effectively produce natural ...
... deposit will be virtually indistinguishable from other channel deposits . Another fluvial process that is characteristic of arid re- gions is piping - a subsurface sapping of unconsolidated sediments that may effectively produce natural ...
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