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Sand Magnification excercise

What substances or materials can you think of to explore through magnification? Examples of different materials to examine might include soils, fossils, diatomaceous earth, chalk, table salt, and dust. Other ideas: Sugar vs. salt, rocks, leaves, sliced fruit, your hand, hair, feathers, etc. You can also check for the presence of magnetite by running a magnet under the paper containing the sand sample. Magnetite will collect against the paper.