The 4 seasons. Summer, Fall, Winter, Spring.
Seasons.
Earth's climates might be different because they won't be the same
Seasons are caused as the Earth, tilted on it’s axis, travels in a loop around the sun each year. For example, summer happens in the hemisphere tilted towards the sun, winter happens in the hemisphere tilted away from the sun. The poles stay cool because they are never in a direct path of sun light.(those are just examples they’re not really part of the answer.)
north pole
The earths tilt at its axis
These happen because the axis of Earths spin in inclined at an angle from the normal of to the plane in which it orbits the Sun.
Because Earths axis is tilted.
There would be no seasons.
There would be no four seasons if the earths axis was not titled.
23seasoned titled axis
The Earth's rotation on its axis
because of the earths axis
Because it tilts on its axis
Because it tilts on its axis
This titled position of the earths axis is known as inclination of the earths axis. The earth's rotation axis makes an angle of about 66.5 degrees with the plane of its orbit around the sun, or about 23.5 degrees from the perpendicular to the ecliptic plane.
There would be no seasons. The weather in any given area would be essentially the same throughout the year.
The planet Uranus has a tilted axis
Because Earths axis is tilted.