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To find out more about the erosion caused by particles blowing in the wind, rub a piece of sandstone with a piece of limestone over a sheet of black paper. Tiny particles of the softer rock will fall onto the paper.

Now rub pieces of hardwood and softwood with sandpaper, and collect the particles on separate sheets. To more fully illustrate this type of erosion, experiment with different grades of sandpaper.

You will understand that these experiences are examples of how rocks can be eroded and that particles carried by the wind erode softer materials (materials that are softer than the particles) in a similar way.

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