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Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.

Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.

Trace fossils are the marks left by a living organism, such as feces, footprints or impressions of feathers or leaves.

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Other scientists last year described 3.7 billion-year-old fossilized microbial mats, called stromatolites, from Greenland.

One stage in particular – Earthdate 2264 (pictured above) – had worn me down.

Most videogames force you to play through their content in chronological order.

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