Unscramble the highlighted letters for your next clue!

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Across
  1. 4. Gold rush state
  2. 6. Longest river in the US
  3. 8. Fort used in Texas during the Mexican War of Independence
  4. 9. Outlines the structure and power of the US government
  5. 10. Covers 70% of the Earth's surface
  6. 11. Driving force behind surface currents
Down
  1. 1. Astronomer who shared the heliocentric theory
  2. 2. Painted the Sistine Chapel
  3. 3. Largest river in the US by water volume
  4. 5. European history from 1300 - 1600
  5. 7. Surface water is mostly found in this form
  6. 8. Book written by Confucius's students