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Learn about different types of radiometric dating, such as carbon dating.Understand how decay and half life work to enable radiometric dating.Extinction of species is common; most of the species that have lived on the earth no longer exist.*Earth and Space Science: Fossils provide important evidence of how life and environmental conditions have changed.The complete "Paleontology and Dinosaurs" module takes approximately four weeks to teach. " activity is a 30-minute introduction to geologic time.INTRODUCTION Scientists have good evidence that the earth is very old, approximately four and one-half billion years old.Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers.
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Time factors of millions and billions of years is difficult even for adults to comprehend.
Specific rock formations are indicative of a particular type of environment existing when the rock was being formed.
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