Question

what lead to the occurrence of season?

Answer 1

Seasons occurs due to the revolution of the Earth around the sun.

Answer 2

The seasons occur because of the tilt of the Earth's rotational axis toward, or away from the Sun as we complete our yearly orbit around the Sun.The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-cicular path around the sun).