geomorphology & earth landforms section 3 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Gneiss is a high-grade metamorphic rock formed by the metamorphosis of granite which is a sedimentary rock. Gneiss is typically associated with major mountain building episodes.

It is often foliated (composed of layers of sheet-like planar structures), characterized by alternating darker and lighter coloured bands, called “gneissic banding”.

Answer: (a)

Answer: (c)

Hachures are short disconnected lines drawn on the map to depict the slope of the ground surface. They are drawn in rows; each row being disconnected from the other.

They are short and closely spaced for steep slopes and relatively long and widely spaced for gentler slopes. Hachures are not drawn for levelled areas, such as a flat valley or a plateau top.

Answer: (d)

Answer: (a)

Answer: (a)

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the mantle is the thickest layer (extends from where the crust ends to about 2,890 km), while the crust is the thinnest layer.

The crust ranges from 5–70 km in-depth and is the outermost layer.