Seasons презентация

A season is a part of a year. Most areas of the Earth have four seasons in a year: spring, summer, autumn (British English) or fall (US English), and winter.
In some areas there are a different number of seasons. For example, in the tropical parts of Australia (in the northern parts of Queensland, Western Australia and the Northern Territory), wet and dry seasons are also observed. These are in addition to, or replace the regular season names.
In places which are tropical and subtropical, there are two seasons: the rainy (or wet, or monsoon) season and the dry season. This is because the rain changes more than the temperature.

Summer is the hottest of the four temperate seasons, falling after spring and before 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. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere, and vice-versa.

Autumn, also known as fall in American and Canadian English, is one of the four temperate seasons. Autumn marks the transition from summer to winter, in September or March, when the duration of daylight becomes noticeably shorter and the temperature cools down considerably.

Winter is the coldest season of the year in polar and temperate zones (winter does not occur in the tropical zone). It occurs after autumn and before spring in each year. Winter is caused by the axis of the Earth in that hemisphere being oriented away from the Sun.

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 and vice versa. At the spring equinox, days are approximately 12 hours long with day length increasing as the season progresses.