les CM2 remontent le temps avec la découverte des fossiles

As part of a unit about Evolution, 4^th and 5^th graders are studying fossilization. Therefore, they did an experiment with water, soil and sand in order to understand the meaning of sedimentation. Replacing soil with plaster allowed us to visualize how fossils are formed in a fun way.   

 

First, we filled our container with water,

 then we added some plaster of Paris.  

We needed to make sure that it was the prefect mix- it could not be too hard or too liquid.

Once done, we added some shells from different species: Snails,   mussels,  clams. 

To make sure they would not stick to the plaster, we rubbed some cooking oil on the shells first. After couples of days, we removed the shells and were able to see our fossils.