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Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.

Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods.

Some critics, particularly religious fundamentalists, argue that neither fossils nor dating can be trusted, and that their interpretations are better.

In the medical field, the radioactive isotope Cobalt 60 has been used for radiotherapy to shrink tumors that will later be surgically removed, or to destroy cancer cells in inoperable tumors.

When it decays to stable nickel, it emits two relatively high-energy gamma rays.

After two half-lives, the mother substance will decay another 50%, leaving 25% mother and 75% daughter.

A third half-life will leave 12.5% of the mother and 87.5% daughter.

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The rate of decay is often referred to as the activity of the isotope and is often measured in Curies (Ci), one curie = 3.700 x 10" is the initial amount of radioisotope at the beginning of the period, and "k" is the rate constant for the radioisotope being studied.The amount of carbon-14 in the atomosphere is, on an average, relatively constant.Plants take in carbon-14 through the process of photosynthesis.The units of measure for time are dependent upon the unit of measure for the rate constant.The ratio of "N/N Carbon-14 is a radioisotope formed in our atmosphere by the bombardment of nitrogen-14 by cosmic rays.

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or major players in the technology industry, such as Microsoft, a foothold in the lucrative Chinese market is worth bowing down to certain ethical considerations that would not ordinarily pass in the Western world. In doing so, it's left a trail of controversy in the eyes of privacy and civil liberties groups, not limited to the Electronic Frontier Foundation (EFF), for pandering to the requirements of the 'oppressive' Chinese government.

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