Oxygen naturally occurs in two isotopes (atoms with different numbers of neutrons, hence masses) - O-16 and O-18 Different proportions of O-16 and O-18 are dissolved in water at different temperatures ...
Agattu is unique among the volcanic Aleutian Islands in being composed almost entirely of well-bedded sedimentary rocks. These rocks were clearly deposited in water and are composed chiefly of ...
A LARGE part of this excellent work has already appeared in various journals published in the United States. These contributions are not known, we fear, so widely as they deserve to be—in this country ...
WRITING in 1843, Dr. Abel determined the main structure of the island to be of basaltic trap, granite, siliceous and schistose rock. Mr. Kingsmill in 1865, in his excellent papers on the Geology of ...
This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...
The Geographical Journal has been published since 1831, and was the Society's journal of report until the relaunch in 2000. It has the highest circulation of any British academic journal in its field ...
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