Question

The northern mountain region is susceptible to
A.Earthquake
B.Tsunami
C.Heavy rain
D.none of these

Answer 1

Hint:The Himalayas consist of three parallel ranges in its longitudinal extent.These are The Himadri,The Himachal and The Shiwalik.

Complete answer:
A number of glaciers descend from the Himadri such as the Gangotri and the Yamunotri. They lie in Uttarakhand. These glaciers are the perennial source of water for the Ganga and Yamuna rivers, respectively.Sharda, Ghagra, Kosi and Gandak rivers originate from this range.
An earthquake is defined as a tremor below the surface of the earth which causes shaking of the crust. These devastating tremors are caused by the stresses that break the earth's crust.
The severity of earthquakes is measured on the Richter scale. A series of shocks that result from sudden earth movement, e.g. along a fault, are known as earthquake (seismic) waves. The waves spread out from the seismic focus of the earthquake and can cause widespread destruction.
The direction of movement of waves and their passage at a particular point is recorded by an instrument called Seismograph. It has a Den attached to it. The pen vibrates with the earthquake waves, recording their movements on a travelling strip of paper.

Hence, the correct answer is option (A).

Note:The P-waves and S-waves travel through the interior of the earth. The surface waves (or L-waves) are the last to arrive. The S-Waves are slower and do not pass through liquids. It is these waves that make the inhabitants of the earth feel the ground motion. The point of origin of these waves (called Seismic waves) is called Seismic focus. Epicentre is the point on the earth's surface directly above the seismic focus.