1
2
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4
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6
Across
- 2. The tiny building block that makes up all living things
- 5. A curved piece of glass that bends light
- 6. The force that slows things down when they rub together
Down
- 1. A tool that makes far-away things look closer
- 3. The part of an experiment that stays the same for comparison
- 4. The speed of something in a given direction