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Across
- 2. The part of an experiment that stays the same for comparison
- 6. The central part of a cell that controls its activity
- 8. A pattern of energy moving through space or matter
- 9. A chemical change when substances interact
Down
- 1. The act of moving or changing position
- 3. A curved piece of glass that bends light
- 4. A mountain with an opening that can erupt hot lava
- 5. Small pieces of rock and soil carried by water and wind
- 7. A hard solid piece of the Earth made of minerals