The word volcano is derived from the name of an island

The primary waves of earthquake are also called ______________.

On the basis of the frequency of eruption volcanoes are classified into

The earthquake scientists are called

Active volcanoes are also called __________.

Extinct volcanoes are also called ___________.

The science that deals with earthquakes

The point on the Earth's surface which is vertically above the focus is called ___________.

A circular opening on the Earth's surface is called

The intensity of earthquake is measured on the