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What are "dirty thunderstorms"?

Dirty thunderstorms are the ultimate explosive combination. These crackling ash clouds are essentially lightning created by volcanic eruptions. This dynamic display results from the same thing that causes regular lightning: ice particles colliding to produce a static charge, only with rock and ash thrown into the mix. According to the BBC, these voltaic visuals are actually pretty rare, except for at Mount Sakurajima in Japan, where it happens on an almost daily basis. Poor Japan.
 
423. What does G stand for in films?

In the words of the Motion Picture Association, G is for General Audiences — all ages admitted, meaning there is nothing in theme, language, nudity, sex, violence or other matters that the ratings board thinks would offend parents whose younger children view the picture.
 
What is Noble Prize ?

The Nobel Prize is the legacy of Sweden's Alfred Nobel (1833–1896). Prizes are awarded to ‘those who, during the preceding year, shall have conferred the greatest benefit on mankind.’ When he signed his last will in 1895, Nobel declared that the bulk of his estate should be converted into a fund and invested in safe securities. The four institutions in Sweden and Norway (the two countries were united between 1814 and 1905) conferring the prizes were to be the Swedish Academy of Sciences, Karolinska Institutet in Stockholm, the Academy in Stockholm and a committee of five people to be elected by the Norwegian parliament (Stortinget).
 
Why third molars are called wisdom teeth ?

The eruption of our third molars marks a transitional period in our lives between adolescence and adulthood. It is thought that with age, we become wiser and more mature. Thus, these late arrivers were nicknamed "wisdom teeth." Wisdom teeth may come in straight, not causing any problems with the other teeth.
The molars or molar teeth are large, flat teeth at the back of the mouth. They are more developed in mammals.
 
407. What are Rubies and Sapphire ?

Ruby and Sapphire are oxides of Aluminium. They have the same chemical composition and crystal structure - they are both varieties of the mineral corundum. Rubies: The most desired variety of corundum is the ruby. The red color is produced by trace amounts of chromium in the mineral.
Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue.
 
What is Hypothalamus ?

Hypothalamus: a part of the brain that controls things like thirst, hunger, body temperature, and the release of ? many hormones.
A chemical message released in the body by cells and glands that affects other cells in an organism.
 
405. What is Carbon Sequestration ?

Carbon sequestration describes long-term storage of carbon dioxide or other forms of carbon to either mitigate or defer global warming and avoid dangerous climate change. It has been proposed as a way to slow the atmospheric and marine accumulation of greenhouse gases, which are released by burning fossil fuels.
 
What is Geo Thermal Energy ?

Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energyrange from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.
 
What are Micronutrients ?

Micronutrients are nutrients required throughout life in small quantities for a wide range of physiological functions enabling the body to produce enzymes, hormones and other substances essential for proper growth and development. These include dietary trace minerals in amounts generally less than 100 milligrams per day, as opposed to macrominerals, which are required in larger quantities. The microminerals or trace elements include iron, cobalt, chromium, copper, iodine, manganese, selenium, zinc and molybdenum. Vitamins are also micronutrients and perform diverse biochemical functions.
 
What are essential fatty acids?

Human body can synthesize most of the fats it require. However, two essential fatty acids, linoleic and alpha-linolenic, cannot be synthesized in the body and must be obtained from food. These basic fats, found in plant foods, are used to build other specialized fats called omega-3 and omega-6 fatty acids.
 
What is photosphere?

Photosphere is the outer shell of star from which light is radiated. It is the innermost layer of the solar atmosphere to which our eyes can penetrate through the superficial transparent layers. Our view is obstructed beyond this layer by the rapidly increasing opacity of the denser layers of the gas as we go inward through it. Temperature of photosphere for Sun is about 5,800 K and values of pressure & density are low.
 
What is largest cell in human body ?

The largest cell in the human body is the female egg, also known as ovum; it's 1000 micrometres in diameter. The smallest cell in terms of volume is the sperm cell—it's little more than a nucleus propelled by mitochondria and a flagellum.
Male Sperm is the smallest cell in the human body.
 
Why do animals have tails?

Many animals, such as felines,mammals and insects have tails. The tail has many functions. In Africa animals have evolved into growing tails to brush away flies. It is also used for balance, by animals such as cats and kangaroos.
Although, the Arctic Fox uses it's tail for warmth, and the fish uses it to move through water. It is very peculiar that animals have gotten to use tails in ways you would never would have predicted. Some fish also use it to inject venom into their prey, thus bringing the conclusion that tails have evolved to defend, attack and even warm the animal itself.
 
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