ppt on season made by Prachi Khurana.

1. Seasons

2. Seasons
winter
Summer
Spring
Autumn
monsoon

3. winter
 Winter (/ˈwɪntər/) is the coldest season of the year
in polar and temperate climates, between autumn and spring.
Winter is caused by the axis of the Earth in that hemisphere
being oriented away from the Sun. Different cultures define
different dates as the start of winter, and some use a definition
based on weather. When it is winter in the Northern Hemisphere
it is summer in the Southern Hemisphere, and vice versa. In
many regions, winter is associated with snow and freezing
temperatures. The moment of winter solstice is when the sun's
elevation with respect to the North or South Pole is at its most
negative value (that is, the sun is at its farthest below the
horizon as measured from the pole). The earliest sunset and
latest sunrise dates outside the polar regions differ from the date
of the winter solstice, however, and these depend on latitude,
due to the variation in the solar day throughout the year caused
by the Earth's elliptical orbit (see earliest and latest sunrise and
sunset).

4. Summers
 Summer is the hottest of the four temperate seasons,
falling between spring and autumn. At the
summer solstice, the days are longest and the nights are
shortest, with day-length decreasing as the season
progresses after the solstice. The date of the beginning
of summer varies according to climate, tradition and
culture, but when it is summer in theNorthern
Hemisphere it is winter in the Southern Hemisphere, and
vice versa.

5. Spring
 Spring is one of the four conventional temperate
seasons, following winter and preceding summer. There
are various technical definitions of spring, but local
usage of the term varies according to local climate,
cultures and customs. When it is spring in the Northern
Hemisphere, it will be autumn in the Southern
Hemisphere. At the spring equinox, days are
approximately 12 hours long with day length increasing
as the season progresses. Spring and "springtime" refer
to the season, and also to ideas of rebirth, rejuvenation,
renewal, resurrection and regrowth. Subtropical and
tropical areas have climates better described in terms of
other seasons, e.g. dry or wet, monsoonal or cyclonic.
Often the cultures have locally defined names for
seasons which have little equivalence to the terms
originating in Europe.

6. autumn
 Autumn is the season after summer and before winter. In
the United States this season is also called fall. In the
Northern Hemisphere, it begins with the autumnal equinox
in September and ends with the winter solstice in
December. In the Southern Hemisphere, it runs from the
autumnal equinox in March to the winter solstice in June.
 In many places, autumn is a time for harvesting most
crops. Deciduous trees (trees that lose their leaves every
year) lose their leaves, usually after turning yellow, red, or
brown. In many countries, autumn is the time a new school
year starts. In the UK, the period of school between the
start of September and the end of December is known as
the 'Autumn Term'.

7. Monsoon
 Monsoon is traditionally defined as a seasonal reversing wind
accompanied by corresponding changes in precipitation,[1] but is
now used to describe seasonal changes in atmospheric circulation
and precipitation associated with the asymmetric heating of land
and sea. Usually, the term monsoon is used to refer to the rainy
phase of a seasonally changing pattern, although technically there is
also a dry phase.
 The major monsoon systems of the world consist of the West
African and Asia-Australian monsoons. The inclusion of the North
and South American monsoons with incomplete wind reversal has
been debated.
 The term was first used in English in British India (now India,
Bangladesh and Pakistan) and neighbouring countries to refer to the
big seasonal winds blowing from the Bay of Bengal and Arabian Sea
in the southwest bringing heavy rainfall to the area.The south-west
monsoon winds are called 'Nairutya Maarut' in India.

8.  by- prachi khurana
 7-E
 2015