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

Answer: (c)

The underground water of Karst topography carves our impressive channels and caves that are susceptible to collapse from the surface. When enough limestone is eroded from underground, a sinkhole (also called a doline) may develop. Sinkholes are depressions that form when a portion of the lithosphere below is eroded away.

Answer: (d)

The average temperature on Earth is about 61o F (16o C). But temperatures vary greatly around the world depending on the time of year, ocean and wind currents and weather conditions.

Summers tend to be warmer and winters colder. Also, temperatures tend to be higher near the equator and lower near the poles.

Answer: (d)

Answer: (a)

The water gains kinetic energy as it falls down and loses its potential energy. Assuming no other losses, part of the kinetic energy gain of water is converted into heat, raising the temperature of water.

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: (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.