Crossword Puzzle

1. ________________ pulls back against an airplane's forward movement and reduces lift.
4. The Empress _________________ Tzu'u Hzi declared war in support of the Boxers against foreigners in China during the Boxer Rebellion.
8. When Austria-Hungary found that they had support from Germany, they issued a harsh _______________ to Serbia.
9. An __________________ is an agreement to cease fighting. It is usually hoped that then a treaty can be signed that will bring lasting peace.
11. The north and south poles can be thought of as the Earth's ____________ sticking out on each end.
12. Germany hoped that soon France would become ________________ because of their great losses of men and give up.
14. The Boxer Rebellion started when war was declared by China against every nation with _______________ to China.
18. Because the Allies were unable to ______________ Germany, the Great War became a terrible, long, grinding war.
19. In North America we fuel our cars with _______________.
20. Karl Benz made the first automobile with an _________________ combustion engine to go into commercial production--even though he only sold 25!
21. The Wright brothers figured out how to control an airplane's ____________ by warping the wings.

2. __________________ were ordered to be paid by China to all the nations that had been harmed by the Boxer Rebellion.
3. The rudder of an airplane controls it's _____________, the movement around the plane's vertical axis.
5. Belgium wanted to remain _________________ but had to fight back when Germany tried to move troops through in order to attack France.
6. When the ___________________ sound of artillery was quiet, the soldiers on the front lines were relieved.
7. The Wright brothers discovered that they needed to design a wing with more ______________ and built an air tunnel to test over 200 wing designs.
10. Not controlling the _______________ of an airplane could allow it to crash nose first into the ground.
13. Austria-Hungary wanted to _______________ against Serbia when their archduke and duchess were killed, but wanted back-up from Germany.
15. The British buy ______________ to fuel their cars, but it's the same thing we fuel our cars with.
16. Otto Lilienthal is considered the first ____________ because of his studies of birds and his many glider flights.
17. As automobiles and airplanes were developed, new ways to ______________ crude oil into fuels developed as well.