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This resource contains an abundance of information to comb through and it has the possibility of being an activity you can engage with for a couple of days. The material needed list is very long, but you can substitute items like disposable bowls for the pans or any mix of outdoor soils. The Plaster of Paris would be the biggest investment, but a bucket can last you for a long time. You could always consider to use another substance like chalk powder or even gelatin (both would be need to be mixed with water) to make the mold. I loved that the resource was tabbed because it felt like I was reading a book that was organized. The summary portion also listed the different learning objectives for this activity helping home educators be able to provide proof of concepts learned. Students should begin to read the background tab and make note of all the wonderful vocabulary that is highlighted. I really enjoy the fact that the resource takes a straightforward activity and introduces different variables that can affect the outcome. It asks students to hypothesize, observe results and draw conclusions just like a real scientist. It also has links to careers in STEM under the procedures tab if your learner is particularly engaged with this topic.