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

Answer: (b)

Igneous rocks are formed through the cooling and solidification of magma (or lava). As hot, molten rock rises to the surface, it undergoes changes in temperature and pressure that cause it to cool, solidify, and crystallize.

There are over 700 known types of igneous rock, the majority of which are formed beneath the surface of the Earth’s crust. However, some are also formed on the surface as a result of volcanic activity.

Answer: (d)

Answer: (b)

Loess is Aeolian sediment formed by the accumulation of wind-blown silt, typically in the 20– 50 micrometre size range, twenty per cent or less clay and the balance equal parts sand and silt that are loosely cemented by calcium carbonate.

It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs. The word loess, with connotations of origin by wind deposited accumulation, is of German origin and means “loose.” It was first applied to the Rhine River valley loess about 1821.

Answer: (d)

Answer: (d)

Answer: (d)

An earthquake is also known as a quake, tremor or temblor. At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground.

It is the result of a sudden release of energy in the Earth's crust that creates seismic waves.