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Mrs. Piatak’s eighth grade science students at Coal City Middle School recently explored the differences between igneous, sedimentary, and metamorphic rocks through a practical project. The class was tasked with determining which type of rock would be most suitable for building a dream patio.
Students examined six rock samples: limestone, shale, calcite, and sandstone (all sedimentary), granite (igneous), and slate (metamorphic). They tested each sample for mechanical weathering by rubbing them with two different grits of sandpaper. Chemical weathering was assessed by applying drops of hydrochloric acid to each rock.
After completing these tests, students evaluated which rocks were most resistant to weathering and selected the best option for a patio that could withstand environmental conditions. As part of the assignment, they also calculated the cost per square foot for constructing an 8 by 12 foot patio using their chosen material. Many students found the potential expense surprising.
