Arena - WikiVisually

Arena - WikiVisually

Arena - WikiVisually

Sandblasting on sand dunes.

arena is a set of loose rocks or minerals small fragments. In geology sand is called the composite material of particles whose size varies between 0.063 and 2 millimeters. An individual particle within this range is called grain or sandstone. A consolidated rock composed of these particles is called sandstone (or psamita) or calcarenite, if the components are chalky. Particles below 0.063 mm and up to 0.004 mm are referred to as silt, and above the sand grain measurement and up to 64 mm are called gravel.

Components and characteristics [edit] h2>

Kalalau Arena Beach, Hawaii (field width = 5.5 mm). A few grains of olivine typical of volcanic sand can be seen.

The most common main component of sand, in terrestrial environments and non-tropical shores, the silica is generally in the form of quartz. However, the composition varies according to the local characteristics of the rocks of the area of ​​origin. Part of the fine sand found in coral reefs, for example, is crushed limestone that has passed through parrotfish digestion. In some places there is sand containing iron, feldspar or even plaster.

Depending on the type of rock from which it comes, the sand can vary greatly in appearance. For example, the volcanic sand is black, while the sand of the beaches with coral reefs is usually white.

The sand is transported by wind, also called wind, and water, and deposited in the form of beaches, dunes, dunes, etc. In the desert, sand is the most abundant type of substrate. The granulometry of the wind is very concentrated around 0.2 mm in diameter of its particles, which are also very rounded.

Quartz sand is used to make glass for its properties such as extraordinary hardness, crystal perfection or high melting point, and, together with gravel and cement, it is one of the basic components of concrete.

Quartz sand with heavy mineral levels (dark and smaller grains).

Sand of a dune, grains very selected and rounded by the wind transport.

The volume of a quartz sand grain, with a diameter of 0.06 mm (the lower limit), is 2.51 × 10 m³ with a mass of 6.66 × 10 g (0.67 mg). In the upper limit, the volume and the mass of a grain of sand with a diameter of 2,10 mm are 8.80 × 10 m³ and 2.33 × 10 g (23 mg).

Granulometry [ In the granulometric classification of the soil particles, the sands occupy the following place in the ladder:

Arena: Bethel's nemesis loved and hated warrior is complex but beautiful.

Related news