The New Encyclopaedia Britannica, Volume 6Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 12
... rocks in the Superior and Slave provinces record major development of granite about 2,500,000,000 years ago . Antedating the granite , and largely engulfed by it are thick , tightly folded beds of basaltic lava , volcanic ash , banded ...
... rocks in the Superior and Slave provinces record major development of granite about 2,500,000,000 years ago . Antedating the granite , and largely engulfed by it are thick , tightly folded beds of basaltic lava , volcanic ash , banded ...
Page 64
... rocks detached from rock walls . Rockfalls are distinguished by a very high velocity resulting from the free fall . Their size ranges from isolated stones to enormous masses of rock . The stones and blocks that fall build up talus , or ...
... rocks detached from rock walls . Rockfalls are distinguished by a very high velocity resulting from the free fall . Their size ranges from isolated stones to enormous masses of rock . The stones and blocks that fall build up talus , or ...
Page 704
... rocks . Clarke estimated that 95 percent of crustal rocks are of igneous origin ( formed from molten silicate masses , or magmas ) . Sedimentary rocks occur as a thin veneer on an igneous or metamorphic basement , except where locally ...
... rocks . Clarke estimated that 95 percent of crustal rocks are of igneous origin ( formed from molten silicate masses , or magmas ) . Sedimentary rocks occur as a thin veneer on an igneous or metamorphic basement , except where locally ...
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