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Sun The sun is our closest and best studied of all star . It is orbited by eight planets and their satellites , five dwarf planets , asteroids , comets , meteorites and cosmic dust particles , so that the sun is the central star of the solar system . Solar energy in the form of sunlight and heat to life on Earth via photosynthesis , and affects climate and weather on Earth .
Actual consisting of hydrogen ( about 74 % of its weight , or 92 % of its volume ) , helium ( about 24 % by weight and 7 % by volume ) and a small amount of other elements , including iron , nickel , oxygen , silicon , sulfur , magnesium , carbon, neon , calcium and chromium.
The lifespan of the star of this spectral type is about 10 billion years ago, and since the sun is about 5 billion years, is in the middle of its life cycle.The sun rotates, but there are so-called differential rotation, rotating layers, ie, the rotation period is the same heliographic equator and the poles.Life on Earth depends on the Sun.
How to make shell pearls?
Approximately 4,000 years ago a Chinese fisherman , to satisfy his hunger , he decided to open a few seashells , and so is likely to become the first man to discover the pearls !
Pearls are built from exactly the same pearly substance that makes up the inner surface or " setup " shellfish - oysters . Ostrigino body is very gentle ; to protect it from injury , it secretes a fluid that has the same composition as the pearl and it coats the inside of their protective shells , which relies on the body .
Once the inside of a shell falls into something that her body can hurt , like a grain of sand , oyster it immediately encapsulates the several layers of pearly substance which coats the inside of their shells and stray grains of sand becomes a pearl !
When all this occurs naturally , the pearl can be perfectly shaped . The man , however, is found to assist in the preparation of oyster pearls, you just need to add a fine grain of sand or a piece of mother of pearl in an oyster . After two or three years , if you remove the oysters from the water and opened it , takes out a real pearl . This process is called " cultivation of pearls ," and do not usually make such perfect pearls as natural .
In Japan , however, found a way to guarantee a perfect fit for the production of " survival rate of pearls ." Substance that stimulates an oyster to create a pearl is injected directly into ostrigino body . It is a very sensitive and delicate surgery that requires utmost attention and skill because ostrigino body can not in the least hurt .
The largest pearl that has so far been found is about 5 cm long , with a volume of over 10 cm ! It is well known that the real pearls very precious , and many people meet by buying fake pearls . The French have a technique for producing beautiful artificial pearls pierced Stack lene beads coated with substances derived from the bright scales of some fish , and the interior of the beads fill with wax .
How are snowflakes
They are a specific form of ice that formed in the clouds , is also a form of water vapor . When the temperature is 0 ° C or lower water changes its physical state and goes from a liquid to a solid state of aggregation - the ice .
Lower temperature means less kinetic energy of molecules and decrease the degree of freedom in their movement and molecules have enough energy to attractive forces are overcome , and the structure is firm .
The creation of cereal depends on several factors other than temperature , such as air currents and humidity and dust grains that can pridonieti overall increase in mass flakes and cause various flaws in the structure of the crystal, and this crystal is susceptible to dissolution.
Heavier snowfall is more realistic to expect temperatures around zero or even slightly above , because then the air has more moisture . Most of the clouds passing through a process called compressed expansion cooling . The mass of air rises to the upper layers of the atmosphere where it spreads due to lower atmospheric pressure and while it cools , thus reducing the amount of water vapor that turns into a cloud .
When the temperature of the air close to the ground are low enough , expansion and cooling already starts with a very low amount of water vapor . This means that the clouds are formed in cold weather conditions , but have less moisture in it , and the ice crystals . In order to create a snow needed these small crystals as so . seeding ( the same role may have a tiny speck of dust ) .
If the cool air , but not too cold , ice crystals begin to form conglomerates which produce flakes . If it is too cold , it will not occur flakes , but the crystals have a needle shape.
There is no the lowest limit of the temperature at which they will create ice crystals , but there is a limit of the temperature at which it will produce flakes . Such is often the case in the Arctic where these Meteorological phenomena called ice fog . So , the snow may be cold , but it must be really really cold . If the soil temperature drops to -20 ° C becomes unlikely that 's going to snow . So if you do not like snow hope for low temperatures .
Ice crystals themselves are very small , they usually about 1mm in diameter , while snowflakes can be great one until (according to the Guinness Book of Records ) 38cm which was the size of a snowflake in the U.S. state of Montana!
Generally hexagonal crystals formed in high clouds , needle , or hexagonal plate-like crystals formed in a lower cloud at higher pressures . Colder weather favors the development of cereal with sharper peaks and the formation of dendrites ( branches in the crystal) .
The crystals formed in warmer conditions grow more slowly and are less branched. Also lower pressures induce the formation of less branched dendrites because the contact between the crystals is reduced to a larger space , ie . dilution is greater.
Unlike the ice crystals in the snow , frost is also formed , or freeze the water vapor dew, which is formed only close to the ground . A very common form of the snowy slopes of the surface begins . They are very obvious by light reflection from the surface of these tiny crystals that are usually quickly melts in the sunlight .
from 0 ° C to -4 ° C - Thin hexagonal plate-like crystals
from -4 ° C to -6 ° C - needle crystals
from -6 ° C to -10 ° C - The hollow column crystals
from -10 ° C to -12.5 ° C - hexagonal toothed crystals
from -12.5 ° C to -16 ° C - Dendrites
Although you seem to be crystals of snow equal on all sides , this is not true since the shape of the crystal effect changes in temperature, different grains of dust and the like . The truth is that many crystals are symmetrical , and the reason is that the shape of the crystal is reflected in the arrangement of the crystal water molecules , which are linked together by hydrogen bonds between the hydrogen and oxygen atom , which forms so created šestogaone orijentirajući during the crystallization so as to reduce as much as possible the repulsive forces between the atoms and the attractive force of the reinforce .
The smallest forms that appear in the form šestogaone prisms , but these are specific cases only small kritale that grow very slowly so that all surfaces of the crystals were as correctly as possible .
In contrast to the snow sleet form water droplets that freeze on the way to the ground , and the real snow crystals do not form .
Because the water is clear and the question arises as to the snow white. The short answer would be that the crystal has a lot of reflective surface to reflect the light in all sorts of colors , and this is how white light .
Nerdlingen is a village of 20,000 inhabitants, located in the Nordlinger Reese, 25 km wide meteorite crater. A city that is in the historic first mentioned 898 years, make up the house with a red roof and Gothic churches, arranged in a circle. Sixties of the last century, scientists have discovered at this place called shock quartz and only then the residents learned that the crater was formed meteorites, and not due to an erupting volcano. It is assumed that the crater was created about 14.5 million years ago.
When you join man and nature, there is a surreal beauty!
Tokom tridesetih i četrdesetih godina prošlog veka, nacisti su često pljačkali domove ljudi, pretežno Jevreja, otimali im umetnička dela i druge dragocenosti.
Kada se rat okrenuo protiv njih, mnogi su počeli da uništavaju ono što su ukrali. Veliki deo blaga bacili su u Jezero Toplic, u susednoj Austriji.
Lost Treasure of the Confederacy
In mid-1865, the Confederacy began to weak and while the South was about to surrender, the government Konferedarcije is thinking up what to do with stocks of wealth. It is said that a large amount of gold buried somewhere near Washington.