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

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)

The correct chronological order of the geological eras (in million years before the present) are as follows:-

1. Cretaceous: 72.1-145;
2. Jurassic: 152.1-201.3;
3. Triassic: 208.5-201.3;
4. Permian: 254.2-298.9.

Answer: (a)

An earthquake is the result of a sudden release of energy in the Earth’s crust that creates seismic waves. The world’s earthquakes are not randomly distributed over the Earth’s surface.

.They tend to be concentrated in narrow zones. An explanation is to be found in plate tectonics, a concept that has revolutionized thinking in the Earth’s sciences. Plate tectonics tells us that the Earth’s rigid outer shell (lithosphere) is broken into a mosaic of oceanic and continental plates which can slide over the plastic asthenosphere, which is the uppermost layer of the mantle.

The plates are in constant motion. Where they interact, along their margins, important geological processes take places, such as the formation of mountain belts, earthquakes, and volcanoes.

Answer: (a)

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

Answer: (d)