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Radioactive dating of rock layers

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Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Tuff can be classified as either igneous or sedimentary rock.
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How Is Radioactive Dating Used to Determine the Age of an Object?

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By: Tracy V. When paleontologist Mary Schweitzer found soft tissue in a Tyrannosaurus rex fossil , her discovery raised an obvious question -- how the tissue could have survived so long? The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains , decomposes. Only hard parts, like bones and teeth, can become fossils. But for some people, the discovery raised a different question.
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Dating Fossils in the Rocks

There is more to the Earth than what we can see on the surface. But of course, the interior of our world continues to hold some mysteries for us. Even as we intrepidly explore other worlds and deploy satellites into orbit, the inner recesses of our planet remains off limit from us.
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Rock Seeker. When you buy through links on our site, we may earn an affiliate commission at no additional cost to you. Petrified wood is created when, in another time, trees that have fallen get washed downstream and eventually buried under layers of mud and ash from volcanoes and other materials.
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