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Product details
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Some sample entries:
PERLITE
An hydrated, silicic, volcanic GLASS with curved, concentric, `onion-skin' cracks probably arising from volume changes associated with the HYDRATION. Used commercially for thermal insulation and as a rooting medium.
HYDRATION LAYER DATING
A dating method for OBSIDIAN artefacts based on the phenomenon of OBSIDIAN'S absorbing water at a rate dependent on its chemical composition and the ambient temperature.
CORE
1 The central part of the Earth extending from the GUTENBERG DISCONINUITY with the MANTLE at 2900km to the centre of the Earth at 6370km. The composition is predominantly iron and nickel, but it must contain some other element(s) to reduce the DENSITY to its known value. The outer core, from about 2900-4980km, is fluid, and the site of generation of the GEOMAGNETIC FIELD, while the inner core, below 5120km, is solid. 2 A cylindrical specimen of rock recovered by drilling.
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