The New Encyclopaedia Britannica, Part 3, Volume 12Encyclopaedia Britannica, 1980 - Encyclopedias and dictionaries |
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Page 248
... rock that have melted or forced their way into surrounding strata ) , certain volcanic and ig- neous rocks , the age of rock relative to mineralization periods , presence of favourable rocks , and climatic condi- tions may be important ...
... rock that have melted or forced their way into surrounding strata ) , certain volcanic and ig- neous rocks , the age of rock relative to mineralization periods , presence of favourable rocks , and climatic condi- tions may be important ...
Page 256
... rock are quarried - igneous , meta- morphic , and sedimentary . The most common igneous rock is granite ; several sedimentary rocks are quarried , and marble , quartzite , and slate are common metamor- phic types . The two products of ...
... rock are quarried - igneous , meta- morphic , and sedimentary . The most common igneous rock is granite ; several sedimentary rocks are quarried , and marble , quartzite , and slate are common metamor- phic types . The two products of ...
Page 580
... rocks Shales Deformed and crumpled sediments Carbonates Sandstones Basement rocks 0 tectogene belt open - ocean trench sea level 100 miles 150 kilometres modern island arcs . Elsewhere , the belts contain gneisses ( a metamorphic rock ...
... rocks Shales Deformed and crumpled sediments Carbonates Sandstones Basement rocks 0 tectogene belt open - ocean trench sea level 100 miles 150 kilometres modern island arcs . Elsewhere , the belts contain gneisses ( a metamorphic rock ...
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