Global Context
description
Transcript of Global Context
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Global Context
Chapter Three
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Earth BasicsSurface Area = 510 million square km197 million square miles
70% Water30% Land
Freshwater covers about 1% of earth’s surface
Freshwater = 3% of total water supply of which 1% is available
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Earth Basics
Bulk of land is located in the Northern Hemisphere = > 65%
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Global Coordinate System
Latitude Longitude
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Global Coordinate SystemLongitude (Meridians)-Run north and south and measure east
and west of the Prime Meridian (0o)
Closely associated with time and time zones.
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Longitude
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Global Coordinate SystemLatitude (Parallels)-Run east and west and measure north
and south of the equator (0o)
Closely associated with insolation and amount of daylight and darkness.
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Latitude
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Seven Parallels
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0o
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23.5 o N
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23.5o S
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66.5 o N
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66.5 o S
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North Pole
90o N
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South Pole
90o S
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Seven Parallels
Equator 0o degrees
Arctic Circle 66.5o N
Tropic of Cancer 23.5o N
Tropic of Capricorn 23.5o S
Antarctic Circle 66.5o S
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North Pole & South Pole
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Zones of Latitude
Equatorial Zone 0o - 7o N & S of Equator
Sub Arctic 55o - 66.5o N
Tropics 7o - 23.5o N
Tropics 7o - 23.5o S
Antarctic 66.5 o – 90o S
Sub Tropics 23.5o - 35o S
Sub Tropics 23.5o - 35o N
Middle Latitudes 35o - 55o N
Middle Latitudes 35o - 55o S
Sub Arctic 55o - 66.5o S
Arctic 66.5 o – 90o S
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Revolution of Earth
June 21 – Summer Solstice Dec 21 – Winter Solstice
March 20– Spring Equinox
Sept 22 – Fall Equinox
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Characteristics of Zones of Latitude
Equatorial Zone 0o - 7o N & S of Equator
Sub Arctic 55o - 66.5o N
Tropics 7o - 23.5o N
Tropics 7o - 23.5o S
Antarctic 66.5 o – 90o S
Sub Tropics 23.5o - 35o S
Sub Tropics 23.5o - 35o N
Middle Latitudes 35o - 55o N
Middle Latitudes 35o - 55o S
Sub Arctic 55o - 66.5o S
Arctic 66.5 o – 90o S