Radiometric dating isotopes Thai sex chat com

Many isotopes have a ratio of protons to neutrons that renders them unstable and, as a result, they are radioactive.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.These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.Elements are defined by the number of protons in an atom's nucleus.For example, an atom with 6 protons must be carbon, and an atom with 92 protons must be uranium.In addition to protons, the atoms of every element (except the simplest form of hydrogen) also contain neutrons.

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A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.Numerical ages estimate the date of a geological event and can sometimes reveal quite precisely when a fossil species existed in time.

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