CONTAMINATION
CONTAMINATION
ENVIRONMENTAL
OZONELAYER
HOLEOZONE
ACIDRAIN
DEFOREST
PROBLEMS
DEFOREST
EROSION
RIVERS
RIVERS
CAUSES
TREE
TREE
A
D
E
A
W
V
F
K
G
C
A
E
Z
N
I
Z
E
P
C
W
O
B
S
X
U
U
X
A
O
A
R
R
I
V
E
R
S
S
I
Z
O
R
F
C
S
X
B
N
M
O
U
E
M
C
M
Z
B
T
O
T
N
K
X
K
E
E
T
U
S
X
I
H
Y
O
E
L
F
N
U
E
U
S
A
N
A
A
C
I
D
R
A
I
N
U
O
U
E
O
O
F
R
H
O
I
M
O
O
E
J
U
M
T
O
I
U
L
O
M
A
E
K
I
B
I
O
N
E
U
B
T
S
E
Z
G
A
U
O
T
V
J
T
K
N
T
X
R
E
O
I
I
T
A
Y
Y
E
F
Q
I
K
A
N
A
E
I
T
N
F
E
S
X
S
G
E
T
Z
A
R
E
N
R
T
D
S
W
O
I
A
I
Z
B
Z
R
G
K
V
O
T
I
E
I
C
M
C
Z
M
J
U
J
W
D
I
T
L
W
J
H
M
U
O
U
E
A
O
Y
O
M
X
N
E
O
A
H
I
K
V
A
X
N
O
L
U
E
G
U
J
M
H
F
L
F
I
S
P
X
T
A
S
U
B
S
L
E
E
V
G
A
O
A
I
I
U
I
M
N
Z
O
B
O
E
O
U
D
V
L
A
R
I
D
I
I
U
U
O
E
I
I
R
S
H
Z
M
O
E
Y
E
T
R
E
E
D
A
C
P
R
A
P
V
F
O
M
S
M
S
S
P
B
P
E
N
V
I
R
O
N
M
E
N
T
A
L
T
I
T
P
Y
G
K
D
I
D
E
F
O
R
E
S
T
M
X
Y
S
