Chain Crosswords Long Science Easy — Set 21

Easy 11×11 Set 21
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6
Across
  1. 3. The remains of a plant or animal from long ago preserved in rock
  2. 4. A substance made of two or more elements bonded together
  3. 6. Two or more atoms joined together
Down
  1. 1. The amount of space something takes up
  2. 2. A hard solid piece of the Earth made of minerals
  3. 5. A unit of information that passes traits from parents to children