Students will work in groups of two to measure pH of freshwater system when crayfish are present in water sample. A control will be set-up and the biology of the crayfish will studied. The pH should increase as the crayfish releases ammonia as a waste product. (Ammonia is a base)
This is a review lesson on the three different types of rocks. (Metamorphic, Sedimentary, Igneous) Students will compare/contrast two of the three rocks using a Venn Diagram, and answer questions about erosion and weathering.