Monday, May 11
Before now our rock collection had been a jar at the nature table. We still have the jar for larger rocks, but now we have started a collection for smaller rocks to compare, examine and study. The clean egg carton does a great job keeping it organized.
After collecting rocks outside on a few of our walks, we sorted through them to choose 12. The rocks were cleaned with an old toothbrush, soap and water.
After a good scrubbing, they were dried and put into the egg carton.
They can be compared by color, size, weight, and more. They can also be examined with the magnifying glass. Eventually we can sketch the rocks too. We also tested the rocks for hardness by using the scratch test. First, the rock is scratched with a fingernail, then a coin, and then a nail (ours is filed down to prevent injury). My daughter really likes the scratch test. The softest rock can be scratched by a fingernail and the hardest rocks can only be scratched by a nail or not at all.