What cause the seasons on earth in a easy way to explain?

The seasons are caused by the tilt of the Earth's axis. As the Earth orbits the Sun, different parts of the planet are tilted towards or away from the Sun. This causes the amount of sunlight that different parts of the Earth receive to change, which in turn causes the seasons to change.

When the Northern Hemisphere is tilted towards the Sun, it receives more sunlight and experiences summer. At the same time, the Southern Hemisphere is tilted away from the Sun and experiences winter. When the Southern Hemisphere is tilted towards the Sun, it receives more sunlight and experiences summer, while the Northern Hemisphere experiences winter.

The solstices are the longest and shortest days of the year. The summer solstice occurs on June 21st, when the Northern Hemisphere is tilted the most towards the Sun. The winter solstice occurs on December 21st, when the Northern Hemisphere is tilted the most away from the Sun.

The equinoxes are the days when the length of day and night is equal. The spring equinox occurs on March 21st, and the autumn equinox occurs on September 22nd.