geomorphology & earth landforms section 4 MCQ Questions & Answers Detailed Explanation

Answer: (b)

The epicentre is the point on the Earth’s surface that is directly above the hypocenter or focus, the point where an earthquake or underground explosion originates.

In the case of earthquakes, the epicentre is directly above the point where the fault begins to rupture, and in most cases, it is the area of greatest damage.

However, in larger events, the length of the fault rupture is much longer, and damage can be spread across the rupture zone.

Answer: (c)

Answer: (b)

An equinox is an astronomical event in which the plane of Earth’s equator passes through the centre of the Sun, which occurs twice each year, around 20 March and 23 September.

On an equinox, day and night are of approximately equal duration all over the planet. They are not exactly equal, however, due to the angular size of the sun and atmospheric refraction.

Answer: (a)

The crag is a mass of hard rock with a precipitous slope on the upstream side, which protects the softer leeward slope from being completely worn down by the oncoming ice.

It, therefore, has a gentle tail strewn with eroded rock debris.

Answer: (b)

Dolomite is a common sedimentary rock-forming mineral composed of calcium magnesium carbonate, ideally $CaMg(CO_3)_2$.

It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Limestone that contains some dolomite is known as dolomitic limestone.

Answer: (a)