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

Answer: (a)

Answer: (a)

The Pacific Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. In a 40,000 km horseshoe shape, it is associated with a nearly continuous series of oceanic trenches, volcanic arcs, and volcanic belts and/or plate movements.

The Ring of Fire has 452 volcanoes and is home to over 75% of the world’s active and dormant volcanoes. It is sometimes called the circum-Pacific belt or the circum-Pacific seismic belt. About 90% of the world’s earthquakes and 81% of the world’s largest earthquakes occur along the Ring of Fire.

Answer: (b)

The mountain pass is a route, through a mountain range over a ridge. Passes provide a route between two mountains tops with a minimum of descent. Passes are often found just above the sources of a river, constituting a drainage divide.

The top of a pass is frequently the only flat ground in the area, a high vantage points, so it is often a preferred site for building.

Answer: (a)

As per the description of the Continental Drift Theory of Wegner, North & South America Continents drifted toward the west due to Tidal force.

Due to the resistance and friction of Sima, the Western coast of the above two continents folded, causing the formation of the Andes & Rockies mountains.

Answer: (a)

In physical geography, the tundra is a biome where tree growth is hindered by low temperatures and short growing seasons.

There are three types of tundra: Arctic tundra, alpine tundra, and Antarctic tundra where the subsoil is permafrost or permanently frozen soil.

Rainfall and snowfall are generally slight due to the low vapour pressure of water in the chilly atmosphere, but as a rule potential evapotranspiration is extremely low, allowing soggy terrain of swamps and bogs even in places that get precipitation typical of deserts of lower and middle latitudes.

Answer: (a)