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Answer:
Sand Paper Rankings. Grades K-12. To demonstrate and the Touch Boards Materials Three rectangular boards: Rough and Smooth Board 1 One divided into two halves: the first half is polished and the second half is covered in sandpaper.
Explanation:
Touch Boards Materials Three rectangular boards: Rough and Smooth Board 1 One divided into two halves: the first half is polished and the second half is covered in sandpaper