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Do you know the difference between sedimentary, igneous and metamorphic rocks? Are you interested in their geologic origin, chemical composition or how each type affects the landscape? Do you know the differences between limestone, granite and marble as building materials? You will find these and lots of other interesting facts about rocks in this second edition of "Rocks and Their Origins" published in 1922. The author, Grenville A. J. Cole, was an English geologist, Professor of Geology in the Royal College of Science for Ireland and an avid cyclist. (summary by J. M. Smallheer)