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Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. [4] [5] [6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen. Much of the Earth was molten because of frequent collisions with ...
The Millennium of Russia monument in Veliky Novgorod (unveiled on 8 September 1862). The history of Russia begins with the histories of the East Slavs. [1] [2] The traditional start date of specifically Russian history is the establishment of the Rus' state in the north in the year 862, ruled by Varangians.
With surplus food stocks created by agricultural development, creation of distinct worker classes and a division of labor would automatically trigger creation of the state form. [ 65 ] A third voluntary hypothesis, particularly common with some explanations of early state development, is that long distance trade networks created an impetus for ...
Hydrogen gas can be created by water reacting with silicates, quartz, and feldspar at temperatures in the range of 25 °C (77 °F) to 270 °C (518 °F). These minerals are common in crustal rocks such as granite. Hydrogen may react with dissolved carbon compounds in water to form methane and higher carbon compounds. [29]
The Bureau of Reclamation was created under the Department of the Interior in 1902, and the United States Forest Service was created under the Department of Agriculture in 1905. The Antiquities Act of 1906 granted the president the power to establish national monuments from federal lands, and Roosevelt established Devils Tower as the country's ...
These form where hydrogen-rich fluids emerge from below the sea floor, as a result of serpentinization of ultra-mafic olivine with seawater and a pH interface with carbon dioxide-rich ocean water. The vents form a sustained chemical energy source derived from redox reactions, in which electron donors (molecular hydrogen) react with electron ...
This page is subject to the extended confirmed restriction related to the Arab-Israeli conflict. Hamas is a Palestinian nationalist and Islamic fundamentalist socio-political organization based in the Gaza Strip with an associated paramilitary force, the al-Qassam Brigades. Hamas (حماس) Ḥamās is an acronym of حركة المقاومة الاسلامية Ḥarakat al-Muqāwamat al ...
Star formation has been occurring continuously in galaxies since that time. The primordial nuclides were created by Big Bang nucleosynthesis, stellar nucleosynthesis, supernova nucleosynthesis, and by nucleosynthesis in exotic events such as neutron star collisions. Other nuclides, such as 40 Ar, formed later through radioactive decay. On Earth ...