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Geology
G
Alphabetical index
123
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Gabbro
Gabbro is grained igneous rock, composed mainly of ...
Gangue
Gangue means all minerals with no economic value in an ore ...
Gel
A gel is a body produced from the solidification of ...
Gems
Gems are minerals with certain qualities (hardness, clarity, ...
Geode
A geode is a more or less spherical open cavity in a rock ...
Geomagnetism
Geomagnetism includes all the phenomena related to the ...
Ghourd
A ghourd is a dominant dune, more or less pyramidal, with a ...
Glaciation
Glaciation is a climate related phenomenon characterised by ...
Globular
The adjective "globular" is used in various ...
Gneiss
Gneiss is metamorphic rock generally composed of dark beds ...
Gondwana
Gondwana was a super-continent which broke up around 150 ...
Gossan
A gossan is a surface zone rich in iron oxides and ...
Graben
A graben is a depressed central compartment which is lower ...
Gradualism
In geology, gradualism is a theory developed by James Hutton ...
Grained rock
Grained rock is rock composed of minerals visible to the ...
Granite
Granites make up the main family of deep igneous rocks, at ...
Granodiorite
Granodiorite is grained plutonic igneous rock, composed ...
Granular
Granular describes a structure in the form of grains, or ...
Granulite
Granulite is metamorphic rock formed by high temperatures ...
Greisen
Greisen is a micaceous rock occurring on the edge of granite ...
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