Total Mass Loading for Selected Metals (Mt/yr)' 
Si 
c 
§ 
S 
s 
S 
8 
S 
8 
8 
8 
% 
•*» 
$S 
o 
$ 
I*) 
« 
5 
o 
.o 
i 
<c 
I 
I 
l| 
:s-5 
I 
o 
(0 
O O 
•S'S 
k a 
C 
(B 
a 
21 
