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Thus this essay, which is my attempt at producing such a source.Contents: The half-life of a radioactive isotope is defined as the time it takes half of a sample of the element to decay. All these methods point to Earth being very, very old -- several billions of years old. Radiometric dating methods are the strongest direct evidence that geologists have for the age of the Earth.Understand how decay and half life work to enable radiometric dating.Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.The 18 August flow was more than 18 m (55 feet) thick and still warm almost a year after congealing.
However, Mt Ngauruhoe is an imposing, almost perfect cone that rises more than 1,000 metres (3,300 feet) above the surrounding landscape to an elevation of 2,291 m (7,500 feet) above sea level (Figure 3).
Mt Ngauruhoe is thought to have been active for at least 2,500 years, with more than 70 eruptive periods since 1839, when European settlers first recorded a steam eruption.