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marganit10  
#1 נשלח : יום רביעי 09 ספטמבר 2009 01:02:29(UTC)
marganit10


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אנחנו יוצאות לשביל ישראל ב11/10,מיד אחרי החגים.

בינתיים אנחנו 2 בנות (דתיות) ומי שרוצה (הפניה בעיקר לבנות) מוזמנת לבוא איתנו בכיף!!!

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נטלי.  
#2 נשלח : יום ראשון 13 ספטמבר 2009 18:22:50(UTC)
נטלי.


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הצטרף: 13/09/2009(UTC)
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abwenzi  
#3 נשלח : יום רביעי 16 ספטמבר 2009 09:03:21(UTC)
abwenzi


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הצטרף: 16/09/2009(UTC)
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When scientists scan the global horizon, over-fishing, loss of species habitat, water shortage, climate change, and invasive species seem to be the biggest threats to the Earth.
What will our world be like in 2050? 
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Population decrease and increase There are two features in the growth of world population. First, the annual increase in population in 15 European countries, in the past few years, has been only 300,000. The United Nations maple story mesos estimates that by 2050, the population of European countries will decrease from the current 0.72 billion to 0.63 billion. Second, the population in developing countries is growing rapidly. Over the past 50 years, the rate wow gold of increase in population has been fastest in the least developed countries. By 2050, the population of Africa is expected to reach 1.8 billion, 0.9 billion more than its current population.
Global warming A recent research report indicates that it is quite possible that the Earth’s temperature is rising well above the previous estimate. Such an result would have severe consequences.    wow gold
A research team from the University of Colorado used satellite data to estimate that the ice sheet will lose up to 48 cubic miles by 2050. In comparison, a city with the size of Los Angeles uses one cubic mile of fresh water every year. Ice shelves in the Antarctic will have decreased by more than 7,200 square miles in the next four decades.  
 ffxi gil
Water shortage Africa’s rivers face dramatic change that will leave a quarter of the continent severely short of water by the middle of the century.
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“In those areas where there is already a water shortage, it’s going to have a devastating effect,” the study says. “If you’re already walking 5 km to the nearest stream to get water, by 2050, it’s going to mean walking 30 km or moving your whole household closer to the water source.”
 
Four wheels good, four wheels bad The car has transformed the lives of people, but the planet is paying too high a price. Today there are 620 million private cars worldwide, to say nothing of buses, vans and lorries. With current growth trends, that number is expected to reach a staggering three billion cars worldwide by 2050.
  
If we continue to burn fossil fuels at current rates, levels of carbon dioxide in the atmosphere will reach 550 ppm (parts per million) by around 2050. This will increase global temperatures between 1.4 and 4.8 by 2050, and sea levels will rise between 0.09 and 0.78 meters.
marganit10  
#4 נשלח : יום חמישי 17 ספטמבר 2009 01:08:27(UTC)
marganit10


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tamarlock  
#5 נשלח : יום שלישי 22 ספטמבר 2009 15:09:35(UTC)
tamarlock


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או במייל (tamarlock@gmail.com)

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flyT  
#6 נשלח : שבת 26 ספטמבר 2009 08:42:51(UTC)
flyT


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הצטרף: 26/09/2009(UTC)
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Black Holes

     What is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region of space (not a thing) into which matter has fallen and from which nothing can escape - not even light. So we can't see a black hole. A black hole exerts a strong gravitational pull and yet it has no matter. It is only space - or so we think. How can this happen? (wow gold)
     The theory is that some stars explode when their density increases to a particular point; they collapse and sometimes a supernova occurs. From earth, a supernova looks like a very bright light in the sky which shines even in the daytime. Supernovae were reported by astronomers in the seventeenth and eighteenth centuries. Some people think that the Star of Bethlehem could have been a supernova. The collapse of a star may produce a White Dwarf or neutron star - a star, whose matter is so dense that it continually shrinks by the force of its own gravity. But if the star is very large (much bigger than our sun) this process of shrinking may be so intense that a black hole results. Imagine the earth reduced to the size of a marble,but still having the same mass and a stronger gravitational pull, and you have some idea of the force of a black hole. Any matter near the black hole is sucked in. It is impossible to say what happens inside a black hole. Scientists have called the boundary area around the hole the "event horizon." We know nothing about events which happen once objects pass this boundary. But in theory, matter must behave very differently inside the hole.wow gold
     For example, if a man fell into a black hole, he would think that he reached the center of it very quickly. However an observer at the event horizon would think that the man never reached the center at all. Our space and time laws don't seem to apply to objects in the area of a black hole. Einstein's relativity theory is the only one which can explain such phenomena. Einstein claimed that matter and energy are interchangeable, so that there is no "absolute" time and space. There are no constants at all, and measurements of time and space depend on the position of the observer. They are relative. We do not yet fully understand the implications of the relativity theory; but it is interesting that  Einstein's theory provided a basis for the idea of black holes before World of warcraft Power Leveling,astronomers started to find some evidence for their existence. It is only recently that astronomers have begun specific research into black hole. In august 1977, a satellite was launched to gather data about the 10 million black holes which are thought to be in the Milky Way. And astronomers are planning a new observatory to study the individual exploding stars believed to be black holes.
     The most convincing evidence of black holes comes from research into binary star systems. Binary stars, as their name suggests, are twin stars whose position in space affects each other. In some binary systems, cd keys,astronomers have shown that there is an invisible companion star, a "partner" to the one which we can see in the sky. Matter from the one which we can see is being pulled towards the companion star. Could this invisible star, which exerts such a great force, be a black hole? Astronomers have evidence of a few other stars too, which might have black holes as companions.
     The story of black holes is just beginning. Speculations about them are endless. There might be a massive black hole at the center of our galaxy swallowing up stars at a very rapid rate. Mankind may one day meet this fate. On the other hand, scientists have suggested that very advanced technology could one day make use of the energy of black holes for mankind. These speculations sound like science fiction. But the theory of black holes in space is accepted by many serious scientists and astronomers. They show us a world which operates in a totally different way from our own and they question our most basic experience of space and time. Runes of Magic gold

 

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