Answer:
The tilt of the Earth's axis is the cause of the changing seasons. As the Earth orbits the Sun, different parts of the Earth receive varying amounts of sunlight throughout the year due to this tilt. When one hemisphere is tilted towards the Sun, it experiences summer because it receives more direct sunlight, while the other hemisphere experiences winter because it receives less direct sunlight. As the Earth continues its orbit around the Sun, the tilt causes the seasons to change accordingly.
