Chain Crosswords Short Nature Easy — Set 21

Easy 11×11 Set 21
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Across
  1. 1. A natural solid substance found in the earth
  2. 3. A unit of information that passes traits from parents to children
  3. 5. The part of an experiment that stays the same for comparison
  4. 7. A state of matter that spreads to fill any space
Down
  1. 2. A form of energy used to power lights and machines
  2. 4. The central part of a cell that controls its activity
  3. 6. A form of energy that allows us to see