SCI BONANZA

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Across
  1. 3. Historically considered the longest river in the world
  2. 7. The largest river by discharge volume flowing through South America
  3. 9. A colorless gas that is the life-supporting component of the air
  4. 11. A stable subatomic particle with a positive electric charge
  5. 12. The positively charged central core of an atom
  6. 13. The highest mountain above sea level located in the Himalayas
Down
  1. 1. The largest hot desert in the world covering much of North Africa
  2. 2. The hardest naturally occurring substance found on Earth
  3. 4. The capital city of Australia
  4. 5. The famous iron lattice tower located in Paris France
  5. 6. A particle representing a quantum of light or other electromagnetic radiation
  6. 8. A cloud of gas and dust in outer space
  7. 10. The force that attracts a body toward the center of the earth