geomorphology & earth landforms section 1 MCQ Questions & Answers Detailed Explanation

Answer: (a)

In regions of rocky deserts, wind abrasion excavates the bands of softer rocks into long, narrow corridors, separating the steep-sided over-hanging ridges of hard rocks, called yardangs.

Instead of lying in horizontal strata upon one another, the hard and soft rocks of yardangs are vertical bands and are aligned in the direction of the prevailing winds.

Answer: (a)

A method is described whereby, using primitive equipment anyone can measure the size of the earth to an accuracy of order of magnitude 10% by observing two sunsets in the space of a few seconds.

Answer: (a)

Bhabhar Region This region is found along the foothills of Shivalik from Indus to Tista without any break.

Since it is made up of stones and pebbles, it is so highly porous that rivers disappear in this region.

Terai Region This region is found to the South of the Bhabhar region. Due to the very high humidity caused due to the reemergence of rivers, this region is very marshy. The speed of river flow in this region is slow. This is a region of dense forests and high biological diversity. Khadar Region It is made up of new alluvium.

In this region, floods bring new alluvium every year. Bhangar Region It is that higher part of the plains, where the floodwater cannot reach. It is made up of old alluvium.

Answer: (d)

Answer: (b)

Answer: (a)

The inner core is the innermost physical layer of the Earth. The asthenosphere is the highly viscous, mechanically weak and ductilely-deforming region of the upper mantle of the Earth.

It lies below the lithosphere, at depths between 100 and 200 km below the surface, but perhaps extending as deep as 700 km.