The New Encyclopaedia Britannica, Volume 23Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 86
... rocks because they occur in many different kinds of rocks and because they crystallize from silica melts in a definite sequence ( see Bowen's reac- tion series ) . In addition to igneous rocks , feld- spars occur in gneisses , schists ...
... rocks because they occur in many different kinds of rocks and because they crystallize from silica melts in a definite sequence ( see Bowen's reac- tion series ) . In addition to igneous rocks , feld- spars occur in gneisses , schists ...
Page 247
... rocks as old as 2,000,000,000 years . The earliest land plants , which occur in Silurian rocks ( between 395,000,000 and 430,000,000 years old ) , are more complicated than algae but are still primitive forms ; plant remains have been ...
... rocks as old as 2,000,000,000 years . The earliest land plants , which occur in Silurian rocks ( between 395,000,000 and 430,000,000 years old ) , are more complicated than algae but are still primitive forms ; plant remains have been ...
Page 679
... rocks and in the Oslo region of Nor- way , but their most extensive development is in northern Nigeria . Rocks containing less than 20 percent quartz are almost never named granite , and the max- imum permissible content for dark ( fer ...
... rocks and in the Oslo region of Nor- way , but their most extensive development is in northern Nigeria . Rocks containing less than 20 percent quartz are almost never named granite , and the max- imum permissible content for dark ( fer ...
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