When a Mars-sized object hit the Earth.
21,000-26,000 years, caused by wobble of earth about its axis.
Quite a few since it's been around for 6+ billion years.
It is a result of the way the earth is tilted on its axis
axis
Yes.
No, seasons are primarily caused by the tilt of the Earth's axis as it orbits the sun. The precession of Earth's axis does affect the timing of the seasons over long periods of time, but it is not the primary cause of the seasons.
Using the definition of revolution around the sun - then as old as the Earth, or about 4.5 billion years. It is essentially unchanged since then. It's rotation around its axis (a day) started later (maybe a quarter of a billion years later) but is constantly slowing down.
There is no known event that has moved the Earth off its axis significantly. The Earth's tilt on its axis does change slightly over thousands of years due to gravitational influences from other celestial bodies, but these changes are gradual and not caused by a single cataclysmic event.
The seasons are caused by the tilt of the Earth's axis combined with its movement around the SUN.
breeze
breeze
The Coriolis effect is caused by the rotation of the earth.