Crushing Test

In this activity, learners design a crushing test and discover that identifying and controlling the variables may be difficult. Although the crushing test will not give conclusive results, it is a good opportunity to discuss variables and why they are sometimes difficult to control. This crushing test is also a good example of how a particular test does not always give enough information to answer a question. This is a follow-up to the activity called "Curious Crystals," in which learners investigate crystals and their properties to identify an unknown crystal. [Activity is publicly available through a web crawler capture on Archive.org. Activity write-up only, images are unavailable.]