Children in class 2 spend the day making 3D volcanoes and creating edible rocks on Friday.
The children were challenged to make a 3D cross-section of a volcano and label the different featrures. They had a great time making them and as you can see from the photographs they all did an amazing job!
In small groups children created edible versions of different rocks to help their understanding of the different features of the rock.
Igneous Rock - these form when molten rock cools quickly. This often occurs near volcanoes. When the magma (molten rock under ground) rises to the surface, it is called lava. When the lava cools it forms igneous rock. There are different types of igneous rocks based on what the rock is made of and how quickly it cools.
We made cinder toffee to represent the Igneous rock - the ingredients were heated to liquid, then when cooled made cinder toffee. It has bubbles and cracks in it as igneous rock would too.
Sedimentary Rock - Sedimentary rocks are made from sediments – bits of dirt, sand, rocks, shells, bones, etc. – that settle into layers. The older layers are on the bottom, they settled first. With a little bit of pressure and time, the sediments stick together and form the rocks we see. To Make edible sedimentary rocks, we used layers of rice crispies covered in melted marshmallow, chocolate chips, and M&M’s.The layers were clear to see with the different coloured ingredients.
Metamorphic Rock - Metamorphic rocks form when existing rocks are exposed to high heat, high pressure, and/or hot mineral-rich fluids. It’s this heat and pressure that push and squish and change the rock into a new type of rock. To demonstrate this we made chocolate hazelnut and cherry fudge!
We started with pieces of chocolate - this represented sedimentary rock layers. By adding hazelnuts and cherries we represented the fossils that were once part of a sedimentary rock. Sometimes fossils can be found in metamorphic rock but often they are squashed and unrecognizable – kind of like when we cut into the fudge.
The heat from the slow cooker and stirring represent the heat and pressure changes that occur to make metamorphic rock. Our end product – the fudge – doesn’t look like the beginning chocolate pieces.
To finish off our day children build their own volcano out of soil and added vinegar and bicarbonate of soda to make volcanic erruptions!
They had a fantastic day and can't wait for science week in March!