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Various minerals, mineral groups, or rocks can be used as geologic
thermometers because their presence or their properties are known to be related
to the temperature under which they formed. For example, the isotopic or
Hardness caused by calcium bicarbonate is known as temporary because boiling
converts it to the insoluble carbonate; hardness from the other salts is called
permanent. Calcium and magnesium ions react with the higher fatty acids of soap
The settlement was originally (1840) a coach station known as Lang's Crossing.
Surveyed in 1858, it became a town the following year and was named after John
Hay, a district parliamentary representative. Developed as a river port, it was ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review