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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.
The test was first administered in 1997 and taken by 2,274 people. Initially the test was held only once a year. [1] In 2009, 180,000 people took the test. [2] The Korean government introduced a law in 2007 that required Chinese workers of Korean descent with no relatives in Korea to attain more than 200 points (out of 400) in the Business TOPIK (B-TOPIK) so they could be entered into a ...
A geostationary orbit, also referred to as a geosynchronous equatorial orbit [a] (GEO), is a circular geosynchronous orbit 35,786 km (22,236 mi) in altitude above Earth's equator, 42,164 km (26,199 mi) in radius from Earth's center, and following the direction of Earth's rotation.
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.
A wooden 3 × 3 geoboard A plastic 5 × 5 geoboard. A geoboard is a mathematical manipulative used to explore basic concepts in plane geometry such as perimeter, area and the characteristics of triangles and other polygons.
Huge landslide at La Conchita, 1995. A geologic hazard or geohazard is an adverse geologic condition capable of causing widespread damage or loss of property and life. [1] These hazards are geological and environmental conditions and involve long-term or short-term geological processes.