![]() ![]() Afterward, take a nature walk and see if you can spot the three different types of rocks. Try this experiment again with a bar of chocolate, a bar of soap or a candle. If the metamorphic rocks become heated, they blend back together and form one solid smooth rock-the igneous rock. This is when the rocks enter the metamorphic rock phase. The pressure from this debris smashes the sedimentary rocks together in layers. Over time, other rocks or debris may fall on top of the sedimentary rocks. ![]() ![]() At that stage the rocks are called sedimentary rocks. Strong winds, rain, hail and other extreme weather conditions can break apart igneous rocks so that they are no longer one whole rock, but a pile of pieces. Weather plays a big part in the rock cycle. That's because the crayons have now started the crayon rock cycle all over again. After they've been melted and cooled, they should feel hard and smooth again just like the igneous rock. The crayons start off smooth and hard, convert to broken up pieces when grated and become stuck together in layers when pressed together. Your crayons have gone through a cycle similar to that of a rock. What do they look like? Are they smooth, hard, rough or soft? Write any notes in your notebook.
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