Chain Crosswords Medium Chain Science Hard — Set 21

Medium 13×13 Set 21
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Across
  1. 1. A state of matter that spreads to fill any space
  2. 6. The wearing away of land by water, wind, or ice
  3. 7. A substance that living things need for energy and growth
  4. 9. A path that electricity travels along
Down
  1. 2. To study something carefully to understand it
  2. 3. A sample of something used for study
  3. 4. A tiny particle of light energy
  4. 5. The speed of something in a given direction
  5. 8. A hard solid piece of the Earth made of minerals