Engineering.

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Across
  1. 7. Engineering that designs and builds machines and engines.
  2. 9. Engineering that focuses on finding and extracting oil and gas.
  3. 10. A Renaissance inventor and artist who designed many machines.
Down
  1. 1. An engineer who improved electrical systems using math.
  2. 2. An engineer who built bridges, ships, and railways.
  3. 3. An inventor who helped create the light bulb.
  4. 4. Engineering that works with nuclear energy and reactors.
  5. 5. An ancient Greek scientist known for discoveries in math and physics.
  6. 6. An industrialist who made cars affordable with assembly lines.
  7. 8. An inventor who developed alternating current (AC) electricity.