Rock Detectives: A Classroom EarthCache
Student teams become geologists for a day. They study real rocks, sort them into igneous, sedimentary and metamorphic, test their hardness with a scratch test, check for limestone with vinegar, and measure layers and grains with a ruler and hand lens. They record what they find in a field notebook, use an ID key to name each rock, and finish by logging their findings the way EarthCache explorers do. About 60 minutes, for grades 3 to 6.
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