Monday, 19 October 2009

What is a fossil?

Which of the following are fossils? 4000 year-old human footprint, a squirrel killed on the road, 3500 million year-old cell filaments, a petrified tree stump, the trail of a 530 million year-old trilobite, dendritic mineral growths, a beach pebble with holes bored by modern marine organisms? Find out by trying 'Fossil or not?' Earthlearningidea.

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