The Earth's axis is tilted because of a process called "axial tilt" or "obliquity". The exact cause of the Earth's axial tilt is still not yet fully understood, but there are some theories that attempt to explain it.

One theory is that the Earth's axial tilt was caused by a collision with a large planetary body early in its history, which caused the planet to be knocked off its original axis. Another theory suggests that the axial tilt was caused by the gravitational influence of the Sun and the Moon over time, causing the Earth's axis to gradually tilt.

It is also possible that the Earth's axial tilt is a natural part of its development and is caused by the Earth's own internal processes, such as the movement of the Earth's molten core.

Regardless of the reason, the Earth's axial tilt has a significant impact on the planet's climate and weather patterns, as well as the distribution of sunlight and temperature around the globe.
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