An article from Science News Jan 2019
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An article from Science News Jan 2019
Earth’s core may have hardened just in time to save its magnetic field
An article from Science News Jan 2019
Prosecco production takes a toll on northeast Italy’s environment
An article from Science News Jan 2019
Desalination pours more toxic brine into the ocean than previously thought
An article from Science News Jan 2019
Satellites make mapping hot spots of ammonia pollution easier
Article
Aeronomy
Aeronomy concentrates on the regions above the tropopause or upper part of the atmosphere. The region of the atmosphere below the tropopause is the site of most of the weather phenomena that so directly affect all life on the planet; this region has…
Biography
Agassiz, (Jean) Louis Rodolphe (1807–1873)
Article
Agate
A variety of chalcedonic quartz that is distinguished by the presence of color banding in curved or irregular patterns (Fig. 1). Most agate used for ornamental purposes is composed of two or more tones or intensities of brownish-red, often…
Biography
Agricola, Georgius (1490–1555)
Article
Albite
A sodium-rich plagioclase feldspar mineral whose composition extends over the range Ab100An0 to Ab90An10, where Ab (= albite) is NaAlSi3O8 and An (= anorthite) is CaAl2Si2O8 (see illustration). Albite occurs in crustal igneous rocks as a major…