The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 133
How Coal Was Formed Accumulation of Plant Debris Appearance of Coal Seams 2. ... Apparently the plants partially decayed and then were covered , preserved , and ultimately compacted by the other sediments that were deposited upon them .
How Coal Was Formed Accumulation of Plant Debris Appearance of Coal Seams 2. ... Apparently the plants partially decayed and then were covered , preserved , and ultimately compacted by the other sediments that were deposited upon them .
Page 134
THE FORMATION OF COAL Coal is derived from the tissues of plants that flourished several hundred million years ago in swamps . As generations of plants grew and died , their debris accumulated as peat until in many areas it was several ...
THE FORMATION OF COAL Coal is derived from the tissues of plants that flourished several hundred million years ago in swamps . As generations of plants grew and died , their debris accumulated as peat until in many areas it was several ...
Page 187
Introduction of Coffee Plants into the West . The Arabs long maintained coffee as a national monopoly . For centuries they exported large quantities of beans but did not permit a fertile seed or seedling to leave their territories .
Introduction of Coffee Plants into the West . The Arabs long maintained coffee as a national monopoly . For centuries they exported large quantities of beans but did not permit a fertile seed or seedling to leave their territories .
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