Geography Reference
In-Depth Information
WASHINGTON, D.C. METRO
AREA MEDIAN HOUSEHOLD
INCOME BY CENSUS TRACT
IN 2009
MARYLAND
120,000 and Above
90,000 to 119,999
60,000 to 89,999
30,000 to 59,999
Below 30,000
Rockville
Greenbelt
Silver
Spring
Reston
WASHINGTON, D.C.
Arlington
Alexandria
Fairfax
VIRGINIA
0
5
10
15 Kilometers
0
5
10 Miles
Figure 1.17
Median Family Income (in U.S. dollars), 2009.
Data from: United States Census Bureau, 2010.
physical geographic criterion, such as the karst region
of China (Fig. 1.18).
A formal region has a shared trait, it can be a shared
cultural trait or a physical trait. In a formal cultural
region, people share one or more cultural traits. For
example, the region of Europe where French is spoken
by a majority of the people can be thought of as a
French-speaking region. When the scale of analysis
shifts, the formal region changes. If we shift scales to the
world, the French-speaking formal region expands
beyond France into former French colonies of Africa
and into the overseas departments that are still associ-
ated politically with France.
A functional region is defi ned by a particular set
of activities or interactions that occur within it. Places
that are part of the same functional region interact to
create connections. Functional regions have a shared
political, social, or economic purpose. For example, a
Search WWH ::




Custom Search