For the last two weeks we have been learning about how rocks are formed. We’ve learnt about three main types of rock: sedimentary rocks, igneous rocks and metamorphic rocks. To help us understand how they are formed we created rocks from playdoh. We found out that sedimentary rocks are formed under the sea over millions of years from particles of rock forming layers on the sea bed, so we created a layered rock from playdoh showing the different strata. The following week we changed these sedimentary rocks into metamorphic rocks by mixing up the rocks to simulate the heat and pressure of the earth acting on these rocks to change them from one type of rock to another. We also used chocolate in a plastic bag which we melted by the heat of our hands to simulate the formation of igneous rocks from molten lava. It was great fun using all these malleable materials to understand rock formation.
