Answer:
spin the globe
Explanation:
The rotation of the Earth on its axis is responsible for the change between night and day. When one part of the Earth is rotated toward the Sun, it is daytime there. When the same part of Earth is rotated away from the Sun, it is nighttime there.
Therefore, Freya could demonstrate the day/night cycle on Earth by spinning the globe, which models how the Earth rotates on its axis.