As we all sat down, after a week of waiting with the steady turning of the rock polisher .. errr... erosion machine ;-) the high interest and eager anticipation was evident.
Everyone was curious.
What would their rocks look like? Could they find their 2 rocks? What would it look like?..
The polisher was opened and the children were surprised by what they saw first.
The water was no longer clear. I poured the water into a large jar and we sat it aside after noting the silt, sand and rock fragments that were making the water gray. It took several hours for the silt to settle to the bottom of the jar.
The children were given the opportunity to touch the water and feel the grittiness of it. Once the liquid was gone and the rocks rinsed the children tried to find their rocks.
The children were asked to note changes in color, hardness, texture. The rocks were returned to the polisher for another week with a finer grit of sand.