4:44 '44 "
4.4: an," 44
4. M! 4114'434444444
. " 443544. '.
Few humans live in total isolation. People are members
of groups with which they share important attributes. If
you are a citizen of the United States of Amer
Refer back to Figure 24 (ecumene) for a moment. Humans
have spread across Earth during the past 7,000 years.
This diffusion of humansettlement from a small portion
of Earths land area to most of it resulted from migration.
To accomplish the spread across
Brain drum in. ii largestaie emigration by Immigration ([1. till] Migration to a new
Mobility (p. hi1] Ali types oi movement from
one location to another.
lmed people. .
Chetntuigrrttinn ip. till Migration oipeople. Internal migration
fr! J i
cfw_72% $363? v?
Ker reams .
Agricultural density tp. 33) The ratio of the t"-
number of farmers to the total amount of E '
, =1 .5."
c' v" .
geographers could he found in the
physieal sciences Geography wart
land editable for agricu
Agricultural dmsity (p. 52) The ratio of the
number of farmers to the total amount of
land suitable far agriculture.
hgtieultural revulntion (p. STE The time
when human beings first domesticated
plume and ammnle and no longer relietl
mural? on h