geomorphology & earth landforms section 7 MCQ Questions & Answers Detailed Explanation

Answer: (d)

The schists constitute a group of medium-grade metamorphic rocks, chiefly notable for the preponderance of lamellar minerals such as micas, chlorite, talc, hornblende, graphite, and others. Gneissic rocks are usually medium- to coarse-foliated and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals.

Mica minerals make some rocks sparkle! They are often found in igneous rocks such as granite and metamorphic rocks such as schist. Most schists are mica schists, but graphite and chlorite schists are also common.

Schist is a crystalline metamorphic rock, mostly composed of more than 50% tabular and elongated minerals.

Answer: (a)

Dendritic drainage systems are the most common form of the drainage system. The term Dendritic comes from the Latin word 'dendron', meaning tree, due to the resemblance of the system to a tree.

In a dendritic system there is one main river (like the trunk of a tree), which is joined and formed by many smaller tributary rivers.

Dendritic systems form in V-shaped valleys; as a result, the rock types must be impervious and non-porous.

Answer: (b)

Because the density of pure ice is about 920 kg/ m³, and that of sea water about 1025 kg/m³, typically only one-ninth of the volume of an iceberg is above water.

Answer: (a)

• Block Mountain – Black forest
• Old Fold Mountain – Appalachian
• Young Fold Mountain – Rocky
• Volcanic Mountain – Vesuvious
• Relict Mountain – Scottish Highlands

Answer: (d)

Answer: (c)

The Kalahari desert is a large semi-arid sandy Savanna in South Africa extending 900000 sq km (35000 sq mi), covering much of Botswana and parts of Namibia and South Africa.

As a semi-desert, with huge tracts of excellent grazing after good rains, the Kalahari supports more animals and plants than a true desert, such as the Namib desert to the West. There are small amounts of rainfall and the summer temperature is very high.

It usually receives 3-7.5 inches (76-190 mm) of rain per year. The surrounding Kalahari Basin covers over 2500000 sq km (970000 sq mile) extending farther into Botswana, Namibia and South Africa and encroaching into parts of Angola, Zambia and Zimbabwe.