geomorphology & earth landforms section 9 MCQ Questions & Answers Detailed Explanation

Answer: (b)

The weight of a body on the earth is the amount of gravitational pull is exerted by the earth.

Similarly, there is another force exerted on a body on earth, that is the centrifugal force due to its rotation which tries to move the body away from the centre of the earth and its maximum at the equator as the velocity of rotation is maximum at the equator of the earth.

The gravitational force is balanced by the centrifugal force. With the increase in the speed of rotation of the earth, the body at the equator will come more under the influence of the centrifugal force and the weight of the body will seem to have decreased.

It is estimated that if the earth rotated 17 times faster than now then the weight of a body at the equator will measure zero.

However, there will not be any change in the weight of a body at any of the poles, since there would not be any change in the centrifugal force there due to an increase or decrease in the rotational speed of the earth.

Answer: (c)

Stromboli is called the lighthouse of the Mediterranean. Stromboli is a small island in the Tyrrhenian Sea, off the north coast of Sicily, containing one of the three active volcanoes in Italy.

Answer: (d)

The heat that caused melting in the Earth’s early history was supplied from radioactivity and a large impact event.

It appears that the Earth formed through a series of collisions with other growing objects in the solar disk, a number of which had iron cores. Each collision added iron to the core and produced a magma ocean.

The only substantial heat sources for the Earth are from the decay of radioactive elements and heat from the giant impacts of accretion. Because Earth’s radioactive elements are concentrated near the surface, heat from the source is rapidly dissipated and does not accumulate.

Answer: (c)

Karst topography is landscape formed from the dissolution of soluble rocks such as limestone, dolomite and gypsum. Sinkhole vary in size from 1 to 600 m both in diameter and depth.

Answer: (c)

Answer: (c)

The Black Mountains are located in USA. The Black Mountains are a mountain range in western North Carolina, in the southeastern United States.