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08 Sep

Clarify that they might have heard of radiometric dating using the element carbon-14 (carbon dating), but carbon is only one of the elements scientists can use to determine the age of a substance.

Carbon dating is useful for determining the ages of relatively young materials — up to about 50,000 years old.

There's a small amount of radioactive carbon-14 in all living organisms.

When they die no new carbon-14 is taken in by the dead organism.

Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.

Add that lunar rocks record not only the Moon's tumultuous past, but Earth's early and turbulent history.

Since there no 4.5-billion-year-old Earth rocks have ever been found to show us that history, we can learn about those impacts from the Moon.

Radioactivity occurs when an atomic nucleus breaks down into smaller particles.

There are three types of nuclear radiation: alpha, beta, and gamma.