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Quadrangle (Quad)

In geometry: a four-sided airplane number such as a square or a rectangle. In soimg.org: an area presented on a conventional topographic map sheet publiburned by the United States Geological Survey. The limits of the maps are typically lines of longitude and latitude.

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Quake

A slang term supplied in place of the word "earthquake." The word "quake" is normally offered for small earthquakes that carry out not reason damages.


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Quarry

A surface mine generally operated to develop cruburned rock for the construction sector, such as limestone, granite, sandrock, or trap rock.


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Quartz

One of the most abundant minerals in the Earth"s crust. Has a chemical composition of SiO2. Quartz is the index mineral for a hardness of seven on the Mohs hardness range. Occurs in sedimentary, metamorphic, and igneous rocks. Several gemstones are created of quartz. These encompass rose quartz, smoky quartz, amethyst, and others.


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Quartz Arenite

A sandstone consisting of at leastern 95% quartz. They are thshould acquire this very high quartz content bereason they have been "recycled." During the initially depositional cycle, they were deposited as impure sands containing quartz, feldspars, micas, and other minerals. Then, in the second cycle, the additional carry and also weathering destroyed what continued to be of the much less sturdy, non-quartz fraction, leaving a nearly pure quartz sand as the residual.


Quartzite

A metamorphic rock created by the modification of sandrock by heat, press, and chemical activity. The metamorphism regularly exerts enough push to weld the original quartz sand right into a polycrystalline mass.


Quartzose

An adjective used in referral to a sedimentary rock that is composed generally of quartz.


Quaternary Period

The the majority of recent duration of geologic time that starts around 2.588 million years ago and also extends to the current. It complies with the Neogene Period and also is split into the Pleistocene (2.588 million years ago to 11.7 thousand also years ago) and also the Holocene (11.7 thousand years earlier to present).


Rapid Clay

Clay-sized pwrite-ups, regularly of quartz and also feldspar, yet occasionally of clay, that lose their strength, collapse, and behave actually choose a fluid as soon as disturbed by vibrations or put under load. They are greatly uncovered in glaciated locations of the northern hemispbelow. Quick clays are regularly associated via landslides, and also they are often the product of faientice in landslides that flow over incredibly gentle slopes.


Quicksand

A bed of sand also that has a high water content. The water within the sand also is often flowing with the spaces in between the sand grains. This creates a soft, fluid-prefer product that yields conveniently to push and in which heavy objects will sink. People and animals have actually been recognized to perish in quicksand also. Creative commons photo by Ralf Schulze.


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