geomorphology & earth landforms section 8 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Internal drainage is a closed drainage basin that retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but converges instead into lakes or swamps.

Such drainage can occur in any climate but are most commonly found in desert locations. For example, the Luni River in Rajasthan has an internal drainage system.

Answer: (d)

The crystal size in the igneous rocks is more a function of the quickness of the process of cooling rather than of the mineral content.

The mineral content determines the melting point of the rocks and the basaltic lava having a higher content of metallic minerals solidifies rapidly once it reaches the surface.

Answer: (d)

One of today’s prevalent water issues is the rise in sea level. It is mainly caused by two phenomena: global warming and ozone depletion. Polar ice caps in Antarctica and other places are melting fast. This has led to increase in sea level over the years.

Answer: (a)

Answer: (d)

Answer: (d)

A flash flood is a rapid flooding of geomorphic low-lying areas: washes, rivers, dry lakes and basins.

It may be caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm or cyclone, or melt-water from ice or snow flowing over ice sheets or snowfields.