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Rock detectives

Can my rock float in water? When I drop water on to it, does it absorb the water? Is the rock hard wearing? Does it crumble when rubbed with sandpaper? By carrying out these tests, Year 3 could determine whether the different types of rock were permeable, buoyant and hard wearing. We discovered that chalk is porous and soft therefore it is a sedimentary rock. A great start to the new term. 
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