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The hexagonal (d = 4.29 g/cm 3) form of germanium dioxide is more soluble than the rutile (d = 6.27 g/cm 3) form and dissolves to form germanic acid, H 4 GeO 4, or Ge(OH) 4. [6] GeO 2 is only slightly soluble in acid but dissolves more readily in alkali to give germanates . [ 6 ]
F2 propagation (F2-skip) is the reflection of VHF signals off the F2 layer of the ionosphere. The phenomenon is rare compared to other forms of propagation (such as sporadic E propagation , or E-skip) but can reflect signals thousands of miles beyond their intended broadcast area, substantially farther than E-skip.
Geophysics is applied to societal needs, such as mineral resources, mitigation of natural hazards and environmental protection. [4] In exploration geophysics , geophysical survey data are used to analyze potential petroleum reservoirs and mineral deposits, locate groundwater, find archaeological relics, determine the thickness of glaciers and ...
Principles of geolocation using GPS. Geopositioning is the process of determining or estimating the geographic position of an object or a person. [1] Geopositioning yields a set of geographic coordinates (such as latitude and longitude) in a given map datum.
The Prizm's 1998 redesign coincided with the conversion of all remaining Geo models into Chevrolets, as General Motors made the decision to discontinue the Geo brand entirely after 1997. The most notable change was an all-new 1.8-liter engine known as the 1ZZ-FE , which powered all Corollas and Prizms, making this generation lighter than its ...
2010 estimates of the potential for electricity generation from geothermal energy vary sixfold, from 0.035 to 2 TW depending on the scale of investments. [4] Upper estimates of geothermal resources assume wells as deep as 10 kilometres (6 mi), although 20th century wells rarely reached more than 3 kilometres (2 mi) deep. [4]
The six geopolitical zones of Nigeria. The Federal Republic of Nigeria is divided into six geopolitical zones, commonly called zones.They are a type of administrative division grouping the country's states, created during the regime of president General Sani Abacha.