big geography the geography of global history. vocabulary to learn: continent pastoral nomad farmer...
TRANSCRIPT
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Big Geography
The Geography of Global History
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Vocabulary to Learn:
• Continent• Pastoral • Nomad• Farmer• Lithosphere• Hydrosphere• Atmosphere• Pangea • Laurasia• Urals
• Monsoon Winds• Wind Cycle• Eurasia• Afro-Eurasia • Great Arid Zone
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We need a mental picture of the whole world, not just certain parts of
it. This is “big geography.”
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South America
Africa
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The Earth is a sphere. Therefore, it cannot be projected on a flat map without distortion. The
question is, which kind of distortion?
The Earth is a sphere. Therefore, it cannot be projected on a flat map without distortion. The
question is, which kind of distortion?
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Three World Map ProjectionsMercator, Peters, and Robinson
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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.
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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
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The largest context of human history is the
entire planet.
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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.
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Conventional definition of a continentA large mass of land surrounded, or nearly
surrounded, by water.
If that is the conventional definition, why are Europe and Asia separate continents?
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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.
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Ura
l Mts.
Another part of the dividing line:Bosporus and Dardanelles
(Straits)
EUROPE
ASIA
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Bosporus
Istanbul
Dardanelles
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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.”
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Africa + Asia + Europe = Afroeurasia
A F R O E U R A S I A
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Think of Afroeurasia as having some seas “inside” it.
Black SeaCaspian SeaMediterranean Sea Persian GulfRed Sea
You figure out which is which?
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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
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Scenes in the Great
Arid Zone of Afroeurasia
Extreme dryness Ahaggar Mts., Sahara Desert
Semi-aridityGrassy steppes of Mongolia
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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
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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.
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Another feature of big geography isthe earth’s great mountain chains
Mountains have been barriers to human communication. But passes across them have also served as
“valves” of communication.
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The major winds and currents of the oceansUntil 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.
summer
winter
Indian Ocean Monsoon Winds
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The wind cycle in the North Atlantic helped Christopher Columbus sail both ways
across the ocean.
WIND
WIND
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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 continent?
But is it possible to think of North and
South America as ONE continent?
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Columbia
Mississippi
Amazon Congo
Niger
Danube
Nile Tigris-Euphrates
Indus Ganges
Mekong
Yangze
Yellow(Huang)
Darling-Murray
Finally, let’s not forget great rivers. They have served as channels of communication
between seas and deep interior lands.
Finally, let’s not forget great rivers. They have served as channels of communication
between seas and deep interior lands.