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

Answer: (d)

Answer: (a)

Cliffs, caves, arches, stacks are some of the landforms produced by wave erosion. Coves form where rock runs in bands horizontal to the direction of wave attack.

There is a band of resistant rock closest to the sea and a band of less resistant rock inland. The waves seek out faults in the hard rock and erode using the processes of abrasion/corrosion and hydraulic action through to the soft rock behind.

Answer: (b)

The course of a river from its source to its mouth is normally divided into 3 sections, namely upper, middle and lower courses. The action of the river on its valley from source to mouth in relation to the features developed by it is seen in the river valley profile, known as a graded profile.

Throughout the long profile of a river, deposition and erosion are balanced meaning that, given enough time, the river’s long profile would become a smooth, concave, graded profile from its source to mouth.

Answer: (b)

Sedimentary rocks are deposited in layers.

At times the particles of rocks are wholly organic in nature. And the rocks are not crystalline.

Answer: (a)

Answer: (c)

Wind erosion may be carried out through deflation, abrasion and attrition :

1. Deflation: This involves the lifting and blowing away of loose materials from the ground.
2. Abrasion: The sand-blasting of rock surfaces by winds when they hurl sand particles against them is called abrasion.
3. Attrition: When wind-blown particles roll against one another in a collision they wear each other away so that their sizes are generally reduced and grains are rounded into millet seed sand, the process is called attrition.