geomorphology & earth landforms section 4 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Answer: (a)

Tropical grasslands (Savannas) are located near the equator, between the Tropic of Cancer and the Tropic of Capricorn. They cover much of Africa as well as large areas of Australia, South America, and India.

They are found in tropical wet and dry climates. These areas are hot year-round, usually never dropping under 64 degrees Fahrenheit. Although these areas are overall very dry, they do have a season of heavy rain. Annual rainfall is from 20-50 inches per year. It is crucial that the rainfall is concentrated in six or eight months of the year, followed by a long period of drought when fires can occur.

Savannas are associated with several types of biomes. Savannas are frequently in a transitional zone between forest and desert or grassland. Savanna covers approximately 20% of the Earth’s land area.

Answer: (a)

Cliff is a high and extremely steep rock face that approaches the vertical, either inland or along a coastline.

Cirque refers to a deep rounded hollow having steep sides, formed through erosion by snow and ice.

Dune is a hill or ridge of sand accumulated and sorted by wind action.

Answer: (d)

Answer: (d)

Lateral or sideways erosion widens the river valley; while, Vertical or downward erosion deepens the river valley. Due to continued lateral erosion, the river valley increasingly becomes broader and shallower.

The valley slopes are also eroded by weathering and mass wasting and by the development of tributary valleys.

Answer: (b)

Hydraulic action is one of the main forms of river erosion (example of erosion due to running water) in which the force of the river against the banks can cause air to be trapped in cracks and crevices.

The pressure weakens the banks and gradually wears it away.