Sort the rocks by color - Match rocks that are similar in color -Grade them from darkest to lightest -What do you notice about the colors?
Sort the rocks by shape -Grade the rocks from largest to smallest - Find rocks that are the same shape (regular, irregular, circular, elliptical, etc.)
Sort the rocks by feeling -Find rocks that have cracks and cleavages -Grade the rocks from roughest to smoothest -Grade the rocks from heaviest to lightest