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What is chemical erosion?

Chemical weathering falls under three major types. Dissolution takes place with limestone and is famously responsible for limestone caves. In oxidation, the surfaces of iron-rich rocks are oxidized in the presence of water, altering the surface and giving it a ruddy appearance. Hydrolysis occurs when certain silicate minerals, such as feldspars, are chemically altered into clay, quartz and basic compounds in solution. Dissolution and hydrolysis are more likely than oxidation to cause erosion.\nThe running water that causes chemical erosion may also cause physical erosion in the same rocks. Rai..

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What is the luster of a diamond?

Minerals with the adamantine luster are extremely rare; only a few other minerals possess comparable sheen. The diamond is considered the superlative example of adamantine, but the luster can be found in other minerals like cubic zirconia. Minerals with similar but slightly duller sheen, like garnet, are known as subadamantine. The greasy luster found in raw diamond ore is more common and can be found in minerals such as opal and chrysocolla.

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What is the normal value of a pus cell?

The accumulation of pus is a normal response from your immune system to fight off infection. Pus is a combination of dead tissue, bacteria and white blood cells. A routine urine test which is found to have abnormally high levels of pus may be the result of a urinary tract infection, kidney inflammation or Lupus, for example.

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How do you use a square-footage calculator?

To measure square footage for a triangle, Calculator.net requires the length of each side of the triangle. For a circle, you need to enter its radius into the calculator. A square foot is the unit of measurement for area and measures one foot long and one foot wide. The measurement is often used for building and home improvement purposes. Home sizes are expressed in square footage, as are room and lot sizes. It's essential to know the square footage of the room when buying flooring or wallpaper.\nBuilding lot sizes are often expressed in acres. A homeowner who wants to know how large of h..

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How do you get blue eyes?

An individual requires working HERC2 and OCA2 genes to be born with brown eyes. If someone has a broken HERC2 or OCA2 gene, the individual is born with blue eyes, because the two genes need each other to make pigment found in brown eyes. Brown eyes have pigment, but blue eyes do not.\nResearch suggests that all humans with blue eyes have a single common ancestor. Scientists found a genetic mutation that happened 6,000 to 10,000 years ago with the OCA2 gene, and it is the cause of all blue eyes in humans today.

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What is glycerin commonly used for?

Glycerin is a primary ingredient in numerous topical products, including emollients, which are used to soften and moisturize inflamed and irritated skin. Glycerin acts by creating an oily layer above the surface of skin to which it is applied. This, in turn, retains water molecules and traps skin irritants, which can then be removed from the area. Glycerin also helps dead skin cells fall off, which makes skin smoother and softer. It is often used for hypo-allergenic soaps, and it thickens hair and skin care products.

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What is heat conduction?

There are four factors that affect the rate of heat conduction: temperature difference, length, cross-sectional area and material.\nConductivities vary for each type of material. It is greatest for metallic solids, lower for nonmetallic solids, very low for liquids and extremely low for gases. Conduction is greater in solids because of the closed and fixed space between atoms. This helps transfer energy between them by vibration. The best ordinary metallic conductors are silver, copper, gold, aluminum, beryllium and tungsten. Fluids are less conductive due to the large distance between atoms, ..

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How long is a year on Uranus?

The third largest planet in the solar system, Uranus is about 31,690 miles in diameter and about 1.8 billion miles from the sun. Its rotational axis is severely tilted so that it rotates on its side. It is encircled by 11 faint, narrow rings made of rock and dust, and it has 27 moons.\nBritish astronomer William Herschel discovered the planet in 1781. He named it Georgium Sidus in honor of Britain's King George III. German astronomer Johann Elert Bode later suggested the name change to Uranus, a reference to the ancient mythological god of the sky, Ouranos.

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How many miles does it take to reach outer space?

Determining the boundary of outer space is fraught with scientific and political issues. The 62-mile boundary adopted by the Federation Aeronautique Internationale (FAI) is the point at which the atmosphere is so thin that commercial aircraft can no longer operate. The issue of overflight rights for satellites, however, has prevented the United States from recognizing this limit. NASA uses 76 miles, the point at which space shuttles switch from thrusters to maneuvering with air surfaces when returning to earth. At 13 million miles, Earth's gravity loses it dominance.

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What are some endangered desert animals?

A member of the antelope family and the largest of all gazelle species, the dama gazelle is listed as critically endangered by the IUCN because only a few hundred individuals remain in isolated groups in countries like Niger, Chad and Mali. The IUCN also lists the addax, another antelope species found in the Saharan desert, critically endangered. Also endangered is the Northwest African cheetah, a subspecies of cheetah also known as the Saharan cheetah. Hunting, droughts and other factors have contributed to the decline of all three species.\nThe Przewalski's horse is that last remaining ..

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