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Geomorphology - Geography Objective Questions with Answers | Page-22

Questions
106 The chief weathering processes are
A Hydration
B Hydrolysis and solution
C Hydrolysis and oxidation
D All of the above

Answer: Option [C]

The correct answer is Hydrolysis and oxidation. Weathering processes are divided into physical and chemical weathering. Physical weathering involves the breakdown of rocks and soils through the mechanical effects of heat, water, ice, or other agents.

107 Orogenic movements are responsible for
A The formation of great continents
B The formation of fault mountains
C The formation of great fold mountain ranges of the world
D None of the above

Answer: Option [C]

Orogenic movements are responsible for the formation of great fold mountain ranges of the world. Orogenic movements, also called horizontal earth movements, are slow movements of the lithospheric plates. When two plates push against each other, it causes the stratas to fold upwards which causes formation of mountains.

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108 How many for each degree of longitude does the local time of any place vary from the Greenwich Time ?
A Four minutes
B Six minutes
C Eight minutes
D Ten minutes

Answer: Option [A]

The correct answer is Four minutes. Each degree of longitude has a time difference of 4 minutes. So, if it's 12 o'clock in Greenwich (0 degrees), it's 12:04 o'clock in 1 degree meridian, and so on.

109 Plutonic rocks are
A Changed rocks under great heat and pressure
B Non-crystalline and often contain fossils of animals and plants
C The igneous rocks formed at some depth in the earth’s crust
D Precipitated chemically from solutions of one kind or another

Answer: Option [C]

Plutonic rocks are the igneous rocks formed at some depth in the earth’s crust. Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. Great globs of molten rock rise toward the surface.

110 Which out of the following is regarded as the chief rock types of the Pre-Cambrian Era ?
A Shale
B Light limestone
C Granite and Gneiss
D Both (A) and (B)

Answer: Option [C]

The correct answer is Granite and Gneiss.

Gneiss: Mineral composition varies from granite to gabbro.

Schists: mostly crystalline, include mica, talc, hornblende, chlorite, etc.

These rocks are oldest rocks [pre-Cambrian era] [formed about 4 billion years ago].

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