Overview of the Geography Unit

1. Big Geography
The Geography of
Global History

2. Objective
• Students will develop a basic
understanding of world geography in
order to become more effective global
thinkers.
You will achieve this by being able to…..
1.Explain the differences between the three different world map projections.
2.List and explain the three different layers of the biosphere.
3.Define “continent” and locate the 7 continents of the world.
4.Write a brief paragraph explaining whether or not you think Europe should be a
continent.
5.Locate the 5 different seas “inside” Afroeurasia.
6.Explain the significance of great arid zones and mountain ranges.
7.Know and be able to locate the 11 seas of Afroeurasia. Also, explain their
importance.
8.Understand the relevance of wind and current in regards to world history.
9.Explain why Afroeurasia, Australia, Americas, Antarctica can be thought of as
the four continents of the world, and be able to locate them on a map.
10.Know and be able to locate the great rivers of the world. Also, be able to
explain there impact on world history.

3. We need a mental picture of the
whole world, not just certain parts of
it. This is “big geography.”

4. Africa
South America

5. Did you know
that how we
“see” the
world depends
on how we
project the
Did you know
that how we
“see” the
world depends
on how we
project the
world?
world?

6. The Earth is a sphere.
Therefore, it cannot be
projected on a flat map
without distortion. The
The Earth is a sphere.
Therefore, it cannot be
projected on a flat map
without distortion. The
question is,
question is,
which kind of distortion?
which kind of distortion?

7. Three World Map Projections
Mercator, Peters, and Robinson

8. On a Mercator projection, invented by Gerardus Mercator in
1569, any straight line is a line of constant compass bearing.
This enables a navigator to plot a straight-line course.

9. Despite the values of the
Mercator Projection, it
distorts the size and shape
of land areas.
Fact: South America is
8 times as large as
Greenland.
Fact: Africa is 14 times
as large as Greenland.
The Peters Projection is an
“equal area” map. It
represents areas accurately,
but it seriously distorts shapes.
Compare the size of Europe to
Africa on the two maps.
Compare the size of the former
USSR to China on the two maps.

10. Human beings inhabit
the biosphere.
The biosphere is made up of three layers.
•The lithosphere: The solid earth, or outer
crust of rock, sand, and soil.
•The hydrosphere: The watery realm. About
97 percent of it is the oceans.
•The atmosphere: The thin layer of gasses,
mainly nitrogen and oxygen.

11. The lithosphere is in constant,
though slow motion.
The surface of the
The surface of the
earth and the
earth and the
location of its land
location of its land
masses have
therefore
masses have
therefore
had a continuously
changing history.
had a continuously
changing history.

12. The scene of history is continuously moving land masses.
Notice in the left column the names of distinct land
masses that no longer exist.
The red dot represents the location of the Grand Canyon. 
Pangaea
Laurasia
Gondwanaland
India
South America
550 Million Years Ago
220 Million Years Ago
190 Million Years Ago
130 Million Years Ago
65 Million Years Ago
Today

13. The largest context of
human history is the
entire planet.

14. 70.9 % of the surface of
the earth is water.
Human beings, however,
are a land-dwelling
species.
We call the biggest land
areas continents.

15. How many continents
are there?
Nine?
One?
Seven?
Five?
Four?

16. But what IS a
continent?
But what IS a
continent?
The conventional map of seven continents

17. Conventional definition of a continent
A large mass of land surrounded, or nearly
surrounded, by water.
If that is the conventional definition, why are
Europe and Asia separate continents?

18. Since the nineteenth century, most scholars have
accepted the Ural Mountains as part of the dividing
Line between “Europe” and “Asia” as continents.
The Urals as a border between continents?
They are not that impressive.

19. Ural Mts.
EUROPE
Another part of the
dividing line:
Bosporus and
Dardanelles
(Straits)
ASIA

20. Bosporus
Istanbul
Dardanelles

21. What significance have the Bosporus and Dardanelles had as
a line dividing peoples from one another in history?
Almost
none!
Almost
none!

22. So, why is Europe a continent?
European scholars of
the nineteenth century
decided that it should
European scholars of
the nineteenth century
decided that it should
be one.
be one.
One of the benefits of
having power in the
world is that you get to
One of the benefits of
having power in the
world is that you get to
name things!
name things!

23. The dividing line between
“Europe” and “Asia” is not
something that is “natural.” That
is, it does not exist as a fact of the
natural world.
Many geographers have therefore
been willing to unite the two
regions as a single continent
called “Eurasia.”

24. Asia + Europe = Eurasia
E U R A S I A

25. But is Africa separated
from Eurasia by a wide
But is Africa separated
from Eurasia by a wide
ocean?
No!
ocean?
No!
Why not think of Eurasia
and Africa together as a
single “supercontinent?”
Let’s call it “Afroeurasia.”
Why not think of Eurasia
and Africa together as a
single “supercontinent?”
Let’s call it “Afroeurasia.”

26. Africa + Asia + Europe = Afroeurasia
A F R O E U R A S I A

27. Think of Afroeurasia as having some
seas “inside” it.
Black Sea
Caspian Sea
Mediterranean Sea
Persian Gulf
Red Sea
You figure out
which is which?

28. One of the big geographical features of Afroeurasia is
the Great Arid Zone. This is the belt of arid or semi-arid
land that extends nearly across Afroeurasia.
Great Arid Zone

29. Scenes in
the Great
Arid Zone of
Afroeurasia
Extreme dryness
Ahaggar Mts., Sahara Desert
Semi-aridity
Grassy steppes of Mongolia

30. Historically, peoples who herd animals as
a way of life have inhabited many parts of
the Great Arid Zone. These herders are
pastoral nomads, that is, they move with
their herds or flocks from pasture to
pasture.
Herders in Mongolia

31. A major theme in world history has been
the dynamic relations between pastoral
nomadic peoples of the Great Arid Zone…
…and peoples who
have been farmers
or city-dwellers.

32. Nomadic peoples of the
Great Arid Zone both
traded and clashed with
farming and city-dwelling
peoples who lived adjacent
to the Great Arid Zone.
One of the greatest clashes
was the attacks of Mongol
nomads on cities of Eurasia
Nomadic peoples of the
Great Arid Zone both
traded and clashed with
farming and city-dwelling
peoples who lived adjacent
to the Great Arid Zone.
One of the greatest clashes
was the attacks of Mongol
nomads on cities of Eurasia
in the 13th century.
in the 13th century.

33. Another feature of big geography is
the earth’s great mountain chains
Mountains have been barriers to human communication.
But passes across them have also served as
“valves” of communication.

34. 2
3
The Eleven Seas of Afroeurasia
They made it easier for people to
communicate by water across Afroeurasia.
4
5
6
8 9
10
11
7
1
Name
these
seas!
Name
these
seas!

35. Before modern times,
merchants relayed goods
from one link in the “chain
of seas” to another. That
is, a single merchant did
not make the trip from one
end of the chain to the
other, though it was
theoretically possible.

36. The major winds and currents of the oceans
Until the coming of steamships in the 19th century, sailors had to know
winds and currents to have confidence that they could sail from one
place to another in an approximate amount of time. These winds
and currents follow large global patterns. It was a matter of
discovering what those patterns were.
winter
summer
Indian Ocean
Monsoon Winds

37. The wind cycle in the North Atlantic helped
Christopher Columbus sail both ways
across the ocean.
WIND
WIND

38. So, how many continents?
• Afroeurasia
• Australia
• North America
• South America
• Antarctica
• Afroeurasia
• Australia
• Americas
• Antarctica
But is it possible to
think of North and
South America as ONE
But is it possible to
think of North and
South America as ONE
continent?
continent?

39. Are the
Americas
one
continent
Troy rt ot wthoin?k of
the Gulf of
Mexico and
the
Caribbean
Sea as bodies
of water
“inside”
the Americas.
Gulf of
Mexico
Caribbean
Sea

40. Finally, let’s not forget great rivers. They have
served as channels of communication between
seas and deep interior lands.
Columbia
Mississippi
Niger
Danube
Indus Ganges
Nile Tigris-
Amazon Congo
Euphrates
Yellow
(Huang)
Yangze
Mekong
Darling-
Murray
Finally, let’s not forget great rivers. They have
served as channels of communication between
seas and deep interior lands.