Question

What combination of factors causes the change of seasons​

Answer 1

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path 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

Answer 2

The combination of the Suns revolution and the fixed angle of the Earths axis results in seasonal changes