Earth’s orbit and tilted axis are the reasons for the occuring of seasons.
Question 6 The change in seasons on the earth occurs because (a) the distance between the earth and the sun is not constant. (b) the axis of rotation of the earth is parallel to the plane of its orbit. (c) the axis of rotation of the earth is perpendicular to the plane of its orbit. (d) the axis of rotation of the earth is tilted with respect to the plane of its orbit.
Tilt in the Earth's axis is one of the reasons behind the different seasons on the Earth.