geomorphology & earth landforms section 6 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Youthful drivers or streams are typically found in the highland or mountainous areas. They are characterized by steep slopes, a relatively small volume of water and rapid flow. Soil particles carried by youthful streams flow along the ground, wearing downhill slopes as the water flows down.

In this youthful stage of the river, such features as small lakes, waterfalls, rapids, V-shaped valleys, gorges and interlocking spurs are frequently found.

Answer: (b)

Answer: (c)

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.

Answer: (b)

Dolomite a sedimentary rock resembling limestone but consisting principally of the mineral dolomite. It is an important source of magnesium and its compounds and is used as a building material and refractory.

Dolomite is used as an ornamental stone, a concrete aggregate, a source of magnesium oxide and in the Pidgeon process for the production of magnesium. It is an important petroleum reservoir rock and serves as the host rock for large stratabound Mississippi Valley-Type (MVT) ore deposits of base metals such as lead, zinc, and copper. Where calcite limestone is uncommon or too costly, dolomite is sometimes used in its place as a flux for the smelting of iron and steel. Large quantities of processed dolomite are used in the production of float glass.

Answer: (d)

In geology, a nappe or thrust sheet is a large sheet-like body of rock that has been moved more than 2 km or 5 km from its original position by faulting or folding.

They form when a mass of rock is forced (or 'thrust') over another rock mass, typically on a low angle fault plane. The resulting structure may include large-scale recumbent folds, shearing along the fault plane.

Answer: (d)

Fold Mountains form when two tectonic plates move together (a convergent plate boundary). Fold Mountains form from sedimentary rocks that accumulate along the margins of continents.