Positive
(a) Volcanic rocks weather to form fertile agriculturally productive soils e.g. basalt.
(b) Geysers are sources of geothermal electricity e.g. at Olkaria.
(c) Hot springs water is pumped into houses for heating during winter e.g. Iceland.
(d) Volcanic features are a tourist attraction e.g. hot springs, geysers and snow capped Mt. Kenya.
(e) Igneous rocks e.g. phonolites are crushed to make ballast for building roads, bridges, etc.
(f) Crater lakes are a source of fish e.g. L. Katwe in Uganda, sources of minerals e.g. L. Magadi and sources of water for domestic use.
(g) Volcanic mountains are catchment areas, sources of rivers and habitats for wildlife.
(h) Pumice a volcanic rock is used as a scrubbing stone.
(i) Vulcanicity is useful for production of gases e.g. carbon dioxide used in soft drinks manufacture.
Negative
(a) Volcanic eruptions cause of life and destruction of property e.g. sulphur dioxide, ash, cinder and lava may bury houses and farm land.
(b) Volcanic mountains are barrier to transport and communication.
(c) Volcanic mountains on the path of rain winds cause leeward slopes to receive little rainfall by preventing rain bearing winds from reaching there.
(d) Volcanic eruptions cause environmental pollution from dust, ash and sulphur dioxide
steve williams answered the question on November 20, 2017 at 00:00
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