Climate

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TYPES OF CLIMATE

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Climate (from Ancient Greek klima, meaning inclination) is commonly defined as the weather
averaged over a long period.
[3]
The standard averaging period is 30 years,
[4]
but other periods
may be used depending on the purpose. Climate also includes statistics other than the average,
such as the magnitudes of day-to-day or year-to-year variations. The Intergovernmental Panel on
Climate Change (IPCC) glossary definition is as follows:
Climate in a narrow sense is usually defined as the "average weather," or more rigorously, as
the statistical description in terms of the mean and variability of relevant quantities over a
period ranging from months to thousands or millions of years. The classical period is 30 years,
as defined by the World Meteorological Organization (WMO). These quantities are most often
surface variables such as temperature, precipitation, and wind. Climate in a wider sense is the
state, including a statistical description, of the climate system.
[5]

Agriculture
Agriculture, also called farming or husbandry, is the cultivation of animals, plants, fungi, and other life
forms for food, fiber, biofuel, medicinals and other products used to sustain and enhance human life.
[1]

Agriculture was the key development in the rise of sedentary human civilization, whereby farming of
domesticated species created food surpluses that nurtured the development of civilization. The study of
agriculture is known as agricultural science. The history of agriculture dates back thousands of years,
and its development has been driven and defined by greatly different climates, cultures, and
technologies. However, all farming generally relies on techniques to expand and maintain the lands that
are suitable for raising domesticated species.






Land
Land, sometimes referred to as dry land, is the solid surface of the Earth that is not permanently
covered by water.
[1]
The vast majority of human activity occurs in land areas that support
agriculture, habitat, and various natural resources.
Some life forms (including terrestrial plants and terrestrial animals) have developed from
predecessor species that lived in bodies of water to exist on land.
Areas where land meets large bodies of water are called coastal zones. The division between land
and water is a fundamental concept to humans, which can have strong cultural importance. The
demarcation between land and water varies by local jurisdiction. A Maritime boundary is one
such political demarcation.

The Westerlies, anti-trades,
[1]
or Prevailing Westerlies, are prevailing winds from the west toward the
east in the middle latitudes between 30 and 60 degrees latitude. They originate from the high pressure
areas in the horse latitudes and tend towards the poles and steer extratropical cyclones in this general
manner.
[2]
Tropical cyclones which cross the subtropical ridge axis into the Westerlies recurve due to the
increased westerly flow. The winds are predominantly from the southwest in the Northern Hemisphere
and from the northwest in the Southern Hemisphere.

A mountain is a large landform that stretches above the surrounding land in a limited area,
usually in the form of a peak. A mountain is generally steeper than a hill. Mountains are formed
through tectonic forces or volcanism. These forces can locally raise the surface of the earth.
Mountains erode slowly through the action of rivers, weather conditions, and glaciers. A few
mountains are isolated summits, but most occur in huge mountain ranges.
High elevations on mountains produce colder climates than at sea level. These colder climates
strongly affect the ecosystem of mountains: different elevations have different plants and
animals. Because of the less hospitable terrain and climate, mountains tend to be used less for
agriculture and more for resource extraction and recreation, such as mountain climbing.

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or
another river. In some rare cases a river could flow into the ground and dry up completely at the
end of its course, without reaching another body of water. Small rivers may be called by several
other names, including stream, creek, brook, rivulet, and rill. There are no official definitions for
generic terms, such as river, as applied to geographic features,
[1]
although in some countries or
communities a stream may be defined by its size. Many names for small rivers are specific to
geographic location; examples are "run" in some parts of the United States, "burn" in Scotland
and northeast England, and "beck" in northern England. Sometimes a river is defined as being
larger than a creek,
[2]
but not always: the language is vague.
[3]

Rivers are part of the hydrological cycle. Water generally collects in a river from precipitation
through a drainage basin from surface runoff and other sources such as groundwater recharge,
springs, and the release of stored water in natural ice and snowpacks (e.g. from glaciers).
Potamology is the scientific study of rivers while limnology is the study of inland waters in
general.

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