Here's why:
* Equator: The Earth is tilted on its axis, and the equator is the area that circles the Earth at 0 degrees latitude. Because of the tilt, the sun's rays hit the equator at a more perpendicular angle, spreading the energy over a smaller area. This is why the equator experiences the most direct sunlight and hottest temperatures.
* Poles: The poles are located at 90 degrees latitude, North and South. Because of the Earth's tilt, the sun's rays strike the poles at a much shallower angle. This means the same amount of energy is spread over a larger area, resulting in less direct sunlight and colder temperatures.
This difference in the angle of the sun's rays is the main reason for the Earth's different climate zones.