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

9. 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.

10. Latitude

14. Seven Parallels

15. 0o

16. 23.5o N

17. 23.5o S

18. 66.5o N

19. 66.5o S

20. North Pole
90o N

21. South Pole
90o S

22. 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

23. North Pole & South Pole

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

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

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