72
Water [n Ecosystems: A Non Renewable Resource
50
o
Figure 12. Map of nitrates in Layer I, November 1990. (For color figure, see page 298)
70
10
Figure 13. Map of nitrates in Layer 2, November 1990. (For color figure, see page 298)
170
50
Fig. 14. Map of nitrates in Layer 3, November 1990. (For color figure, see page 298)