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Comparing the Earth’s lifetime to one calendar year, events like the extinction of dinosaurs and Columbus setting sail take place relatively recently.

The Earth is 4.6 billion years old -- but how can humans relate to a number so colossal, and where do we fit on the geologic timeline?

After all, a dinosaur wouldn’t be caught dead next to a trilobite.

The narrower a range of time that an animal lived, the better it is as an index of a specific time.

Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.

Pretty obvious that the dike came after the rocks it cuts through, right?

That’s because zircon is super tough – it resists weathering. Each radioactive isotope works best for particular applications.

(MS-LS4-1-Analyze and interpret data for patterns in the fossil record that document the existence, diversity, extinction, and change of life forms throughout the history of life on Earth under the assumption that natural laws operate today as in the past.) Teacher Note: Just as the video in the Engage part of lesson used analogies to explain the time scale, this module uses analogies to communicate the idea of how old earth is relative to human events.

Writing in the margins engages readers in the reading task and allows them to document their thinking while reading.

Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.

In a way this field, called geochronology, is some of the purest detective work earth scientists do.

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