geomorphology & earth landforms section 2 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Answer: (c)

The International Date Line (IDL) is an imaginary line on the surface of the Earth, that runs from the north to the south pole and demarcates one calendar day from the next.

It passes through the middle of the Pacific Ocean, roughly following the 180° longitude but it deviates to pass around some territories and island groups.

Answer: (d)

Epeirogenic movements are vertical movements, caused by radial forces and characterised by slow, widespread, largescale upliftment, subsidence or submergence and the emergence of land areas.

Orogenic movements are horizontal movements caused by tangential forces and involve intense folding, thrusting, faulting and uplift of narrow belts. Richter scale – the severity of an earthquake

Answer: (a)

Answer: (d)

The erosive power of a stream is proportional to the square of the velocity. Thus, when discharge increases, the depth increases and the velocity increases, resulting in a dramatic increase of erosive power.

As the volume flowing in a stream increases, the stream's erosive power also increases. At a bend in a stream, the water's momentum carries the mass of the water against the outer bank. The greater depth on the outer side of the bend also leads to a higher velocity at the outer bank.

The greater velocity combined with the greater inertial force on the outer bank erodes a deeper channel. The result of all these actions is a meander

Answer: (b)