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## Main Question or Discussion Point

This is from a website on the effect of the moon on life on earth:

"By counting the growth rings in 400-million-year-old coral fossils and in 3-billion-year-old stromatolites, geologists calculate that Earth was rotating four times faster when it formed than it is today".

They could see growth rings of one day, over a 400-million-year coral? How can they possibly see that?

"By counting the growth rings in 400-million-year-old coral fossils and in 3-billion-year-old stromatolites, geologists calculate that Earth was rotating four times faster when it formed than it is today".

They could see growth rings of one day, over a 400-million-year coral? How can they possibly see that?