On Friday we had a fun afternoon in Year 4 experimenting the effects of deforestation. It took a lot of setting up.
First we had to ask Mr Rowe to use a sharp knife to cut holes ready in the bottles. We then added the same amount of compost into each bottle. After that we had to label each of the bottles A B and C. We added seeds to bottle A, we added leaves and sticks to bottle B and we left bottle C with just compost in.
Bottle A represented a normal forest, Bottle B represented a forest where the trees had been chopped down and Bottle C represented a forest where everything has been chopped down and the trees have been burnt.
Next we had to use the bottom part of bottles with string attached to put onto the bottles we had filled with compost and the other items so that we could pour the water in and see how it would come through. We took the lids off the full bottles and began to pour water into the top of the full bottles.
We noticed that Bottle A had clear water, Bottle B had water with a slight yellow tinge and Bottle C had water with lots of compost in.
This showed us that the plants hold the soil in place so it does not drain away for Bottle A, the layer of leaves and twigs helps to keep most of the soil in place for Bottle B and there is nothing to hold the soil in place for Bottle C.
We had lots of fun predicting and it was very interesting to see the results.