Final answer:
The theme of geography that best reflects the statements about nomads in Tibet is Movement.
Step-by-step explanation:
The theme of geography that best reflects the statements about nomads in Tibet is Movement. The nomads in Tibet move two or three times per year in order to graze their livestock. This highlights the concept of movement, which refers to the mobility of people, goods, and ideas across the Earth's surface.
Additionally, the fact that they live in tents with few possessions and their lifestyle is centered around the constant movement further supports the theme of movement.
Therefore, the correct answer is Movement.
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