第1个回答 2011-06-08
(A) of the self that ⒈. The earth from the original nebula condensed into planets, due to the internal temperature and gravity, the material differentiation and convection occurs, then the gradual differentiation of the Earth circle. In the differentiation process, hydrogen, oxygen and other gases floating to the surface, and through a variety of physical and chemical effects of water the last generation. ⒉ water is cooled after melting in the basalt to form the first time to produce the original crust. Earth is a first cold sphere. Since then, the Earth's interior due to the presence of uranium, thorium and other radioactive elements began to decay, releasing heat. Therefore, the material inside the earth began to melt, high melting point material sinking, easy molten material rising from isolated volatile substances: nitrogen, oxygen, carbohydrates, sulfur and a lot of steam, test proved that when 1 m3 of granite melt , you can release 26 L of water and many completely volatile compounds. ⒊ deep underground magma rich in water, experiments show that pressure is 15 kpa, the magma temperature 1,0000 C, 30% of the water can dissolve. Magma crater at the average moisture content of 6%, some up to 12%, and more to the higher water content in the deep Earth. Accordingly, it was based on the number of magma deep inside the earth there is speculation in the earth 45 million years, the amount of water released deep magma ocean water up to half of the modern world. ⒋ volcanic eruptions release large amounts of water. Situation from the modern volcanic activity, volcanic eruptions are almost always about 75% of the water vapor ejected. 1906 Mount Vesuvius eruption column of pure water vapor as high as 13,000 meters, has been erupting for 20 h. Alaska volcano million cards Temai smoke Valley, there are thousands of natural steam emitting holes, the average per second can be ejected 97 ~ 6450C steam and hot water of about 23,000 m3. Accordingly suggested that the entire history of the Earth, volcanoes thrown out all of the total amount of solid material half the lithosphere, volcano water can also be accounted for half of the modern global ocean of water. ⒌ dehydration decomposition of minerals inside the earth some of the water, or the release of carbon monoxide, carbon dioxide and other gases, at a high temperature hydrogen reacts with water. In addition, the burning of hydrocarbons can also produce water, the hard igneous rocks, there are a number of crystal water and raw water inclusions.
(B) of the exogenous study, said people ⒈ chondrite component, found to contain a certain amount of water, is generally 0.5 to 5%, some as high as 10%, while the carbonaceous chondrites water more. Chondrites are the most common form of the solar system, meteorites, accounting for 86% of the total number of all meteorites. Generally believed that primitive chondrite is the earliest coagulation sun, Earth and other planets in the solar system are made of these condensed from chondrites. ⒉ the solar wind reaches the Earth upper atmosphere, bringing a large number of hydrogen nuclei, nuclear carbon, oxygen and other atoms in the nuclear, the nuclear and electron binding in the atmosphere into hydrogen atoms, carbon atoms, oxygen atoms and so on. And through different chemical reactions into water molecules, it is estimated that the earth's atmosphere high-level, almost every year produced 1.5 t this "cosmic water." Then, this water to rain, snow fell on the earth in the form本回答被提问者采纳