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a lready been stated that plants
It has
r equire a c
trees
penetrate
and w
eans of stability
to me
above
importance
r ule
a
to unde
U
nder any ci
r om w h ich the mineral pa r ts of
f
r ived
H
de
ence
or less includ
soil is o
rock s of the earth
stances
In some cas
h it has be
whic
by Viol
nt convulsion s
and deposited again in other plac
soil is called
r tant form of the latt
most impo
deposits n
ar t
r ses and lakes
cou
r mation of soil i s due
The fo
are either of a mec
mongst t
r ocks p r od uces an unequal strain and p r essu r e
of
them to burst in va
into
inte
r th
r b r eaking up the r ock
thu s fu
agency owing to its dissolving action
IT
Y
O
AND
r tain lay
h ic h p r ovides t h em with nouris h ment and t h e
h
r
quirements
but in the case of s
r take part of
r cumstances
in speaking of the soil
d
r iginally the resul
with the addition of certain organic sub
s
r iv
n de
o
h e sea coast
as w
ll as by the action of air cur
M
A
TI
h anical
h
s
heat takes the foremost place
r io us di r ection s
r stic
s and freezes
T V
FO
T I
r of soil
r
r this lay
ve
subsoil is only of indirect
h allo
r dinary functions of
o
subsoil fu
I
I
N
of the disintegration of the
h e soil now ov
t
d
in other s it has be
r the action of water and a ir currents
s
h e second
and in t
r i s alluvial soil
in river d
N
N
DI
a variety of agencies
chemical
it forc
G
T
TI O
I L
and more especially
into which their
r of soil is d
soils
sub soil has
r nishes t h e mat
soil
the subsoil is more
IL
O
r li
s the rock from
n ca
r st cas
In
fi
ltas
and inland by water
N
IL
O
r ganic nature
or o
Then
if wat
r ticles a sunder
s the pa
r i s al so a po
r oots
ep enough
as
soil
rials
pri
cipally
r ried away
the
h e
T
r med by
fo
r ents
which
heating
which cause
r penetrates
rful
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