Last week Year 3 questioned whether rocks can absorb water. To test our predictions we used the pipettes to carefully place the drops of water onto each rock.
But how did we make this experiment ‘fair’? Well, we placed the same amount of drops onto each rock – therefore the variable we kept the same was the drops of water, and the variable that we changed was the rock!
We closely observed what happened to the water. Did it sit on top of the rock, run off the rock or did the rock absorb the water? We found some interesting results, and amazingly many of our predictions were correct. Great observations Year 3 and such careful use of the pipettes – well done!
Just like a sponge, porous rocks have the ability to absorb water. I wonder if they increase in weight and size as they take in water? How could we measure this? I also wonder whether they absorb other liquids – perhaps you can explore at home.
