Question

what is natural disaster ? what is volcanic eruptions ? how they occur ?

Answer 1

Natural disasters. A natural event such as flood, earthquake or hurricane that causes great damage of life.
Volcanic eruptions. Sudden occurrence of violent discharge of steam and Volcanic material.
How Natural disasters occur?
They caused by Movement of the earth. These occur with the minimum amount of warning and also includes the earthquake, tsunamis and Volcanic eruptions.

Answer 2

a natural event such as a flood, earthquake, or hurricane that causes great damage or loss of life.

"the number of people suffering food crises as a result of natural disasters has tripled in the last thirty years"



another answer is here


A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle.