Question

We already familiar with the devastating power of volcanic eruptions, and could probably list examples of when they have displaced populations, destroyed habitat, disrupted commerce, or killed large numbers of people. However, they also create new islands (think of Hawaii), supply nutrients to soils, create economic mineral deposits (such as gold, diamonds, and copper), and provide geothermal energy. Newly erupted material can also support life on land or in the oceans.So the question is:

1. Is a volcanic eruption primarily constructive or destructive? Why do you think so? Human safety is obviously a top priority whenever eruptions occur, but does this view affect how we should deal with the aftermath of an eruption? Why/why not?

Answer 1

Ans.

We can not say that all type of volcaoes are constructive in nature . The volcanoes formed at the convergent boundaries are destructive in nature since here, two plates comes towards each other and the denser one subducts into other in this process and gets consumed while the another type of volcano is constructive in nature where the two plates are moving away from each other and the lava coming from inside makes new crust (oceanic floor is the best example). Hence it can be both constructive and destructive.

Yes, it affects our way to deal with such disasters and the ways for it are as following -

1. displace people from areas of future possible eruptions. After eruption has occurred at one place, its lava reaches other regions as well disturbing the other areass and hence they should be displaced.

2. After volcanic eruption, whole region is converted into a flat and newly formed land and hence the newly vegetation grown after this will be called as primary succession. Hence this region is highly fertile for agriculture.

3. The places of divergent boundaries create black soil which is also rich for agricultural activities.

4. Hence all this encourages us to evaluate that wether a volcano has become dormant, or extinct or is still active.

Example - Hawaii is extinct now since its supply of magma has cut and creates one of the most fertile land in the region and is economically very important.

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