Ultraviolet light (UV light) is a type of electromagnetic radiation that is located between visible light and X-rays in the electromagnetic spectrum. It is invisible to the human eye, and has a frequency greater than that of visible light but lesser than X-rays. It has a wavelength ranging from about 10 nm to 400 nm (ISO, 2007). UV light is a part of the radiation that comes from the sun. It can also be produced artificially by electric arcs, black lights, tanning lamps and mercury vapor lamps. The name Ultraviolet literally translates to “beyond violet”, as it has a ...
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Several thousand years ago, the early modern humans were nomadic foragers, and they forage in groups. However, a major transition occurred around 10,000 BC changing the human behavior, a changeover from the control of the natural environment over humans, to humans in control over the natural environment. Before the start of the agricultural era, the early humans were hunter-gatherers, which means that they depended on wild resources for their nutritional requirements. This style of living led the early humans to have a largely nomadic lifestyle, with the abundance of food source dictated by the natural environment, specifically the ...
Henry Wadsworth Longfellow
It is common knowledge that every well-educated person should know, understand and appreciate music. However, no matter how well aware of various composers and genres people might be, many of us find it difficult to feel it. There are numerous examples of musicians who can technically perform a piece, but when you listen to them playing, you realize that you might as well listen to a robot. Only the emotion behind the melody gives music a truly human feel and makes it a universal human language that will be understood all over the world. Thus, it is extremely important ...
Until today, over 2000 minerals have been discovered, and constantly on a daily basis, new minerals are discovered. Minerals just like matter is made up of atoms of elements arranged in a particular way together with a definite chemical composition. Notably, minerals are aggregates of nearly all rocks found on the earth’s crust. Geologists define minerals as inorganic materials on and in the earth’s crust with a specific chemical composition. Most minerals are always naturally occurring and it is worth noting that nearly all the minerals contain crystals. This is attributed to the fact that mineral particles are usually arranged in a ...