<span>These three regions have few natural resources and depend on energy resources and external raw materials. They have scarce deposits of natural resources and reserves of mines minerals to subsist. The policies of the communist era and the lack of attention to ecological issues caused serious problems in the environment of several regions.</span>
They are made by melting glaciers
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One of the most destructive hazards associated with composite volcano eruptions are super-heated gases called pyroclastic flows.
<h3>What are pyroclastic flows?</h3>
The pyroclastic flows are harmful mixtures of warmed rocks and gases released during volcanic eruptions.
These pyroclastic flows are very harmful because they reach very high velocities (up 710 km per hour).
In conclusion, one of the most destructive hazards associated with composite volcano eruptions are super-heated gases called pyroclastic flows.
Learn more about pyroclastic flows here:
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According to most scientists it was several factors involved. But the main cause was b) changes in the earth's orbit which occurs every 10,000 to 15,000 years. Other contributing factors are changes in the ocean's currents and major shifts in platonic plates of the planet.
