Volcano Eruptions/Floods

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The volcanic eruption is a phenomenon of nature, usually associated with the extravasation of magma on the planet's surface. The layers of rocks formed by magmatic eruptions are called "spills", as the rock spreads and solidifies on the surface of the globe. The cooled lava usually generates an optimal soil for planting.

 

There are several types of volcanic eruption, differing in the proportion and type of material expelled, and in the violence of this expulsion. 

A flood, in general, can be understood as the result of the concentration of excess rainwater that cannot be absorbed by already saturated soil and other forms of runoff, for example, in urban impermeable areas, where the water flow follows quickly to the lowlands and rivers, surpassing the flow capacity, causing overflows of the margins. Floods  can also be caused by the rupture of dams, or by the opening or overflow of dams during periods of heavy rain.

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Simão Fonseca