Thursday, September 29, 2016

What is a fossil?

A fossil is the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

Groups recipe:

There was a cup made of 50% (75 ml) sand and 50% plaster (75 ml).
There was a cup made of 30% sand and 70% plaster.
There was a cup made of 60% sand (45 ml) and 40% plaster (30 ml).
There was a cup made of 40% sand (30 ml) and 60% plaster (45 ml). 

The mixture that worked the best was 60% sand and 40% plaster. It has the best imprint. The 50% plaster and the 50% sand  was hardest to break apart.

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