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Because 30% of the roughly 180 impact craters on Earth contain minerals or oil and gas, it seems that the cratering promotes the development of natural resources [46] Some of the ores produced from impact-related effects on Earth include ores of iron, uranium, gold, copper, and nickel. It is estimated that the value of materials mined from ...
The biological half-life (the average time it takes for the human body to eliminate half the amount in the body) for uranium is about 15 days. [3] Uranium's radioactivity can present health and environmental issues in the case of nuclear waste produced by nuclear power plants or weapons manufacturing. Uranium is weakly radioactive and remains ...
The first probe to image Mars's surface in detail was Mariner 4 in 1965, and Mariner 9 became the first probe to orbit Mars in 1971. However, few early probes were able to image Mars in high enough resolution to detect new impact craters, which are typically less than 10 meters (33 ft) across. [ 2 ]
One of the advantages of this method is that any sample provides two clocks, one based on uranium-235's decay to lead-207 with a half-life of about 703 million years, and one based on uranium-238's decay to lead-206 with a half-life of about 4.5 billion years, providing a built-in crosscheck that allows accurate determination of the age of the ...
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Earth Days is a 2009 documentary film about the history of the environmental movement in the United States, directed by Robert Stone and distributed by Zeitgeist Films in theaters. Earth Days premiered at the 2009 Wisconsin Film Festival , and released to theatres on August 14, 2009.
WASHINGTON (Reuters) -The U.S. is seeking bids from contractors to help establish a domestic supply of a uranium fuel enriched to higher levels for use in a next generation of reactors, a fuel ...
Vimeo is ending support for its existing TV apps — with the video management and hosting provider telling customers they’ll have a “better ongoing experience” by using video-casting ...