1.
Direct
a. Deposit
of energy
b. Sources
of raw matreials
c. Sources
of fodder and shelter
d. Source
of water
e. Control
of flood and soil erosion
f.
Sources of construction materials
g. Sources
of public reserve
h. Sources
of foreign exchange
2.
Indirect
a. Ecological
balance
b. Recreational
spot
c.
Protection of crops
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