What gneiss is
By: Hector Principe Quiambao
Gneiss is a metamorphic rock that is widely distributed. Its mineral content is mainly feldspar, quartz and mica. These minerals are ingrained in gneiss in such a way that they are still visible to the naked eye. This rock is normally gray or pink with...
How gneiss is formed
By: Mac Pike
Geologists recognize three major classifications of rock. One category is igneous rock; formed from molten material from deep beneath the earth’s surface, known as magma. Examples of igneous rock would include granite, basalt, and pumice. Sedimentary rocks like limestone, sandstone, conglomerate and mudstone are...
What gneiss is
By: Michael Ojelabi
In dialectological terms, the word gneiss was coined from the German verb, gneist, a reference to glittering rock. Some other authorities claim that gneiss was actually an old Anglo-Saxon mining expression applied on worthless or valueless material or object. In physical terms gneiss refers to...
By: Blaise Pascal
Gneiss, pronounced as ‘nice’, is one type of metamorphic rock found all over in the world today. This metamorphic rock is usually identified by distinctive bands of lighter and darker materials as well as its coarse surface. The banding, or foliation as it is...
By: Blaise Pascal
The formation of coaloccurs over the course of a very long period. Most of the coal that people mine and use today was formed around 300 to 400 million years ago. Coal is basically the decayed remains of plant matter that was once thriving and...
By: Julie Thomas-Zucker
The ways that mountains form is the geologic process called orogeny. . Different types of rock determine how high the rocks will rise. Two main branches of science concerned with orogeny are geology and geochronology. The movement of tectonic plates through earthquakes and volcanoes accelerate the...
Geography: What is a second order stream
By: Nick Ford
A second order stream is a term are used primarily in physical geography and hydrology. It describes a watercourse which is fed by two other streams. Second order streams are typically shallow, fast flowing and found in upland areas. Arthur Newell Strahler introduced the idea...
By: Keith Redfern
A second order stream forms part of the classification of stream order relating to drainage basins.The area which drains water into a river’s mouth or estuary is known as a drainage basin. Stream order relates to the pattern made by streams and rivers...
By: J. Lang Wood
Agates are easily-recognizable stones that show the complex layering of materials, called drusy, from which they are composed. Agates come in many different appearances, from the single eye of the Mexican agate to the delicate filaments of the moss agate that suggest vegetative material in...
By: Kathie Danner
A natural, untreated sapphire’s hue comes strictly from its impurities. Corundum forms in igneous and metamorphic rocks. The more pressure the corundum receives over time, the clearer the sapphires are when mined. All sapphires are corundum, but not all corundum develops into sapphire. The...

 

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