The volcano is ruptured on the crust of planetary mass such as earth, which allows hot lava, volcanic ash and gases to escape from the magma chamber.
Volcanic activities have spread all over the world and can happen both on land and beneath the ocean. Volcanic activities are especially active in convergent and divergent zones where tectonic plates move away or toward each other.
Examples of volcanoes active in 2018 include Hawaiian volcanic eruption and Oldonyo Lengai mountain in Tanzania.
A volcanic eruption can have both positive and negative effects on human activities and life in general.
Here below are examples of some positive and negative effects of volcanic activities (volcanoes).
Positive effects of volcanic activities.
- Volcanic rocks after weathering result in the formation of very fertile soils and hence encourage agriculture.
- Volcanoes help in the formation of valuable minerals like diamond, gold, silver.
- Volcanoes lead to the formation of geysers which are sources of geothermal electricity which help in domestic and industrial use.
- Volcanoes result in the formation of many features acting as tourist attractions hence foreign exchange: crater lakes, volcanic mountains, geysers.
- Volcanic mountains facilitate moderation of climate and receive higher rainfall than flat areas.
- Fishing is likely to be found in crater lakes.
- Igneous rocks are used for the construction of roads, houses, bridges, etc
Negative effects of volcanoes.
- Volcanic eruption results in loss of lives and properties.
- Some weathered volcanic materials like ashes and granite can result in infertile soils.
- Some volcanic features create barriers making the construction of communication lines difficult and expensive.
- The rugged nature of some volcanic landscapes discourages economic activities such as agriculture.
- The lee-ward sides of the volcanic mountains create a rain shadow.
What other effects of volcanoes do you think we should add?
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