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Seasons

1

A season is a division of the year marked by changes in weather, ecology and hours of daylight.

Ecology is the scientific analysis and study of interactions among organisms and their environment.

A year is the orbital period of the Earth moving in its orbit around the Sun.

Seasons Song Video by Have Fun Teaching

2

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 astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.

Earth is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life.

The Veer Union - Seasons by TheVeerUnionVEVO

3

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.

Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.

In geography, temperate or tepid latitudes of Earth lie between the tropics and the polar regions.

Hibernation is a state of inactivity and metabolic depression in endotherms.

4

During May, June, and July, the northern hemisphere is exposed to more direct sunlight because the hemisphere faces the sun.

The Northern Hemisphere of Earth is the half that is north of the equator.

5

The same is true of the southern hemisphere in November, December, and January.

6

It is the tilt of the Earth that causes the Sun to be higher in the sky during the summer months which increases the solar flux.

In radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted or received, per unit time, and spectral flux or spectral power is the radiant flux per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.

A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates.

Summer is the hottest of the four temperate seasons, falling between spring and autumn.

7

However, due to seasonal lag, June, July, and August are the hottest months in the northern hemisphere and December, January, and February are the hottest months in the southern hemisphere.

Seasonal lag is the phenomenon whereby the date of maximum average air temperature at a geographical location on a planet is delayed until some time after the date of maximum insolation.

8

In temperate and subpolar regions, four calendar-based seasons are generally recognized: spring, summer, autumn and winter.

The subarctic climate is a climate characterised by long, usually very cold winters, and short, cool to mild summers.

A calendar is a system of organizing days for social, religious, commercial or administrative purposes.

Spring is one of the four conventional temperate seasons, following winter and preceding summer.

9

In American English and Canadian English, fall is sometimes used as a synonym for both autumn and autumnal.

American English, also called United States English or U.S. English, is the set of varieties of the English language native to the United States.

10

Ecologists often use a six-season model for temperate climate regions that includes pre-spring and late summer as distinct seasons along with the traditional four.

Climate is the statistics of weather, usually over a 30-year interval.

11

Hot regions have two or three seasons; the rainy season and the dry season, and, in some tropical areas, a cool or mild season.

Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated—that is, become heavy enough to fall under gravity.

The rainy season, or monsoon season, is the time of year when most of a region's average annual rainfall occurs.

12

In some parts of the world, special "seasons" are loosely defined based on important events such as a hurricane season, tornado season, or a wildfire season.

A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain.

A tornado is a violently rotating column of air that rotates while in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.

A wildfire or wildland fire is a fire in an area of combustible vegetation that occurs in the countryside or rural area.

13

Seasons often held special significance for agrarian societies, whose lives revolved around planting and harvest times, and the change of seasons was often attended by ritual.

Agriculture is the cultivation of animals, plants and fungi for food, fiber, biofuel, medicinal plants and other products used to sustain and enhance human life.

A ritual "is a sequence of activities involving gestures, words, and objects, performed in a sequestered place, and performed according to set sequence."

Harvesting is the process of gathering a ripe crop from the fields.

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