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

The forces which originate on the surface of the Earth

The seismologist who invented the Richter Scale.

The primary waves of earthquake are also called ______________.

The forces which originate from within the Earth

The earthquake scientists are called

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

The world's most beautiful volcanic mountain.

The place of origin of an earthquake is

The intensity of earthquake is measured on the