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concentric layers (envelopes) formed by the earth’s matter. Proceeding inward from the periphery to the center of the earth are the atmosphere, hydrosphere, crust, silicate hard mantle (upper and lower), and core with metallic properties (divided into a liquid outer core and an apparently solid central core, or subcore.

The region inhabited by organisms—including the lower part of the atmosphere, the entire hydrosphere, and the upper part of the earth’s crust—is called the biosphere.

References in periodicals archive ?
The essential dichotomy of the two outer geospheres devolves from the gross chemical and physical incompatibility of hydrides and oxides.
Increased interior porosity under the carapace is an essential feature of the dichotomy of the dual outer geospheres.
Hydride reactions at the transition between inner and outer geospheres are primarily molecular hydride reactions with water.
The proposed triple geospheres theory of the Earth is a dichotomy, a core of unknown "ultimetal," a middle geosphere (underworld) of intermetals, energy-rich hydrides, and an outer geosphere or carapace of energy-poor oxides.
The only known contrast between thee two inner geospheres is simple density, whereas the contrast between the outer two geospheres clearly involves latent energy content as well as density.
Thusly, hydride dissociation and oxidation above a steadily degassing inner geosphere originated the lithosphere and continue to maintain it.

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