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Across
- 1. A material that does not let electricity or heat pass through easily
- 6. The force that makes magnets attract or repel
- 8. To study something carefully to understand it
Down
- 2. A group of living things that are the same kind
- 3. The bending of light as it passes from one material to another
- 4. A quick back-and-forth movement
- 5. A substance made of two or more elements bonded together
- 7. A curved piece of glass that bends light