The hazards from the volcanoes include lava and pyroclastics, tephra and , lahars and climate alteration. Fertile soil and geothermal energy are beneficial results of volcanic eruptions. Much of El Salvador for example is convered with volcanic ash and this has been a fertile growing medium for coffee plants.
When the energy of the waves touches the ocean floor, the water particles drag along the bottom and flatten their orbit.
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The answer is: to keep the population isolated from freer societies.
