Advertisement
and oth
r acid s
chemical combinations wit
especially on
addition of water
r ocess
p
accompanied by an increase of volume
h esion of t h e rock
previous co
dioxide and o ther acid s pen
variou s co
stituen
as lim
magnesia
h e rate of c h emical decomposition d
T
r
h e h ig h
tu
t
H
ence
it i s
n mechanical and chemical action
decomposition of
follow
d by mosses
r accele r ate di sintegration by k
furthe
h e roots of these p
ext
t
and assist m
r adually fo r med
g
r
mnan
s of dead plant
highly o rganised plants
follo
ed by shrubs and t
d
pe
and d
h er accelerate disinteg r ation
furt
h is p r o cess has gon
tim e
the o uter part o f th e
r ying depth which
va
gradually from t
r pi
into small
r med o r su r face soil
fo
r s
s
quality of the soil d
FO
M
n and water
com
into contact with the rock
m etals
h yd r ates of m
s and ca
and potas
r the latte r
r
o
rapid in tropical than in cold climates
r ock
appear on
h anical action
c
h ic h consists o f f r ag
w
such as grass
r
per into the
h e solid r ock i
r ock
c
s
ght it would app
pend solely on
TI O
which contains ca
h its elements
as compounds of iron
trates t
r ri
s
several su
h
quicke
r ganic action sets in
o
surface o f
r at
ants penet
In this mann
suitable fo
h ich penet r ate with their roots
es
w
r ents and fissures of the rock
on fo
r
r ust consi sts of a layer of
a
h
s c
comm
ncing from
to brok
or sub soil
h at
a
t
I L
O
r bon dioxide
oxyg
fo
tallic oxides
d
r c
ntaining ca
h e r ock
dissolves its
stances
p
nd s on the tempera
r
d ecomposition
h ave commenced the
ping the su
into
fin
ents
r the suppo r t of m o r e
r bs
s and h
r a su
ficient length of
belo
r ock
n
or b
and ul
imat
co
position and
composition of the
r m
they fo
n acts
r ming
by
h is
T
r oys the
st
r bon
such
L
h en s
ic
ro ck
which
r face moist
r
st fis su
s
r
a soil is
rock an d
r e
th
se a
an d
changes
r as h
h
t
n
ly into
Advertisement
