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Global Context

Global Context. Chapter Three. Earth Basics. Surface Area = 510 million square km 197 million square miles. Freshwater covers about 1% of earth’s surface. 70% Water 30% Land. Freshwater = 3% of total water supply of which 1% is available. Earth Basics.

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Global Context

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  1. Global Context Chapter Three

  2. Earth Basics Surface Area = 510 million square km 197 million square miles Freshwater covers about 1% of earth’s surface 70% Water 30% Land Freshwater = 3% of total water supply of which 1% is available

  3. Earth Basics Bulk of land is located in the Northern Hemisphere = > 65%

  4. Global Coordinate System Latitude Longitude

  5. Global Coordinate System Longitude (Meridians)- Run north and south and measure east and west of the Prime Meridian (0o) Closely associated with time and time zones.

  6. Longitude

  7. Global Coordinate System Latitude (Parallels)- Run east and west and measure north and south of the equator (0o) Closely associated with insolation and amount of daylight and darkness.

  8. Latitude

  9. Seven Parallels

  10. 0o

  11. 23.5oN

  12. 23.5oS

  13. 66.5oN

  14. 66.5oS

  15. North Pole 90oN

  16. South Pole 90oS

  17. Seven Parallels Arctic Circle 66.5o N Tropic of Cancer 23.5o N Equator 0o degrees Tropic of Capricorn 23.5o S Antarctic Circle 66.5o S

  18. North Pole & South Pole

  19. Zones of Latitude Arctic 66.5 o – 90o S Sub Arctic 55o - 66.5o N Middle Latitudes 35o - 55o N Sub Tropics 23.5o - 35o N Tropics 7o - 23.5o N Equatorial Zone 0o - 7o N & S of Equator Tropics 7o - 23.5o S Sub Tropics 23.5o - 35o S Middle Latitudes 35o - 55o S Sub Arctic 55o - 66.5o S Antarctic 66.5 o – 90o S

  20. Revolution of Earth March 20– Spring Equinox June 21 – Summer Solstice Dec 21 – Winter Solstice Sept 22 – Fall Equinox

  21. Characteristics of Zones of Latitude Arctic 66.5 o – 90o S Sub Arctic 55o - 66.5o N Middle Latitudes 35o - 55o N Sub Tropics 23.5o - 35o N Tropics 7o - 23.5o N Equatorial Zone 0o - 7o N & S of Equator Tropics 7o - 23.5o S Sub Tropics 23.5o - 35o S Middle Latitudes 35o - 55o S Sub Arctic 55o - 66.5o S Antarctic 66.5 o – 90o S

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