Uh-oh! The walls are closing in on you in this castle! You need to quickly choose drill bits to drill through various materials in the castle wall. Each drill bit selected must be related to the material that you need to drill through, as it relates to Moh's hardness scale in geology (rocks and minerals).
http://www.fossweb.com/modules3-6/EarthMaterials/activities/mohsdrill.html
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