1. deforestation
2. afforestation
3. overgrazing
4. vegetation removal
afforestation
1. stimulates growth of grasses
2. arrests growth of grasses
3. retards its growth
4. destroys vegetation
stimulates growth of grasses
1. rainfall
2. drought
3. global warming
4. soil erosion
global warming
1. petroleum
2. coal
3. trees
4. nuclear fuel
trees
1. 1819
2. 1927
3. 1925
4. 1972
1927
1. 6
2. 12
3. 24
4. 28
6
1. mine wastes
2. wastes from mine processing
3. land degraded by mining
4. Both(a)and(b)
land degraded by mining
1. mangancese nodules
2. phosphorite nodules
3. magnesium nodules
4. All of these
phosphorite nodules
1. hydropower
2. solar energy
3. wind energy
4. thermal energy
hydropower
1. 75%
2. 60%
3. 50%
4. 40%
60\%