This week, Year 3 conducted two investigations into rocks. The first was testing how hard different types of rocks were, using a ‘scratch test’ and the second was seeing if a rock was permeable or impermeable.
We first had to think about what we variables we could change, what we could keep the same (to make it a fair test) and what we could measure or observe.
The children decided to use the same nail to test each different rock by scratching it three times in the same place, with hopefully the same pressure. We used pipettes to squeeze three drops of water onto the same area of the rock.
Perhaps Year 3, who are all now Petrologists (scientists who study rocks) can tell you a bit more about the different rocks they used and what type of rock they were (sedimentary, igneous, or metamorphic)