Chain Crosswords Medium Chain Science Easy — Set 30

Medium 13×13 Set 30
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Across
  1. 3. A gas in the air that living things need to breathe
  2. 6. The amount of matter in an object
  3. 7. The tiny building block that makes up all living things
  4. 8. A change in a living thing that helps it survive
Down
  1. 1. A material that electricity or heat can pass through easily
  2. 2. The natural home of an animal or plant
  3. 4. A state of matter that spreads to fill any space
  4. 5. The amount of space something takes up