is a division of the year, marked by changes in weather, ecology
and hours of daylight. Seasons result from the yearly orbit of the Earth
around the Sun
and the tilt of the Earth's rotational axis
relative to the plane of the orbit. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to go into hibernation
or to migrate, and plants to be dormant.