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Across
  1. 3. - The measure of how much matter is in an object
  2. 6. - The branch of biology that studies the classification, evolution, and distribution of living organisms
  3. 8. - A device that converts sound waves into electrical signals for recording or amplification
  4. 9. - A particle that carries a negative charge and orbits the nucleus of an atom
Down
  1. 1. - The amount of space that an object occupies
  2. 2. - The process of breaking down food into simpler molecules that can be absorbed by the body
  3. 4. - A type of fossil fuel formed from the remains of prehistoric plants and animals
  4. 5. - The practice of growing plants without soil
  5. 7. layer - A protective layer of gas in the Earth's atmosphere that helps to shield the planet from harmful solar radiation
  6. 10. - A type of rock formed from volcanic lava