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The nebular hypothesis, which proposes that our solar system formed from a giant explosion called the big bang. The earth, which was once extremely hot due to the big bang, was formed from the solidified material in the solar nebula. The age of the earth is estimated to be approximately 4.5 billion years old based on the nebular hypothesis and the radioactive decay of the oldest known rock on earth, found in canada. The document also references a textbook for further reading.
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According the nebular hypothesis, our solar system result from a huge explosion called the Big Bang. Before the Big Bang, there was enormous rotating cloud named as solar nebula. And after the explosion, the solidified Earth which had once high temperature due to the Big Bang was formed and is about 4.5 billion years old. Foundations on Earth support the age of the Earth. For example, the oldest known rock on Earth is about 4 billion years old which is known by looking the radioactive decay of the rock and it founded in the Canada, in the Acasta River which is a sample of gneiss. All in all, the nebular hypothesis and radioactive decay for the oldest known rock on Earth support that the Earth is approximately 4. billion years old, whereas the error for approximation can be a billion year not a small numbers of years.
References: The Origin of the Earth. (N.D.). Retrieved from http:// www.moorlandschool.co.uk/earth/earthorigin.htm
Edward J. Tarbuck, & Frederick K. Lutgens (2003). Earth Science. New Jersey, Pearson Education, INC.