Question

How does the earth’s tilt and movement cause the seasons?

Answer 1

Hint: We know that our planet Earth is tilted 23.5 degrees from the plain of its orbit around the sun. But this tilt changes with a time period. During a cycle, that averages about 40000 years, the tilt of the axis varies between 22.1 degrees and 24.5 degrees. This tilt affects which part of the Earth gets more sunlight during different stages of the year. This is discussed in detail below.

Complete step by step answer:
Many people believe that the changes in seasons over the year are caused by the varying distance of the Earth from the sun. That is, when the Earth is closer to the sun, it's summer all around the globe and when it's farther away from the sun, it's winter. Though it may seem correct, this is not the case. It is true that the Earth’s orbit around the sun is not a perfect circle but elliptical but still this has very little to do with the fact that seasons on Earth keep on changing over the year.
Now, the rotation of earth around its axis causes the effect of day and night and this is the main reason why almost every part on Earth experiences both.
Now as the Earth is slightly tilted, therefore what happens is one hemisphere remains closer to the sun for almost six months. In the next six months, the other hemisphere gets closer to the sun and thus both experience a change in season in due course of time.

Note: Due to the tilt of our planet the polar regions of our planet experience a rather amusing change of seasons. The concept of day and night is not normal in the polar regions. They experience really long summers (day) of around six months followed by really long winters (darkness) of six months. This is why these regions are considered one of the harshest places on earth to live.