What is subsidence caused by?

What is subsidence caused by?
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A rift valley is formed mainly due to: [NDA 2003] (a) forces of tension in the earth's crust (b) the subsidence of the floor of a river valley (c) the valley formed after the formation of fold mountains (d) the deepening of a valley by ice action

Description : A rift valley is formed mainly due to: [NDA 2003] (a) forces of tension in the earth's crust (b) the subsidence of the floor of a river valley (c) the valley formed after the formation of fold mountains (d) the deepening of a valley by ice action

Last Answer : Ans: (b)

Ground subsidence:

Description : Ground subsidence:

Last Answer : When the groundwater withdrawal is more than its recharge rate, the sediments in the aquifer get compacted, which results in sinking of overlaying land surface. This process is known as ground subsidence.

Subsidence of land:

Description : Subsidence of land:

Last Answer : It is mainly associated with underground mining. Subsidence of mining area results in cracks in houses, tilting of buildings, bending of rail tracks.

After the sun rises, rapid heating of the air over the land compared to that over the ocean often causes of near surface air over the land. (a) Localized subsidence and high pressure. (b) Localized convection and high pressure. (c) Localized subsidence and low pressure. (d) Localized convection and low pressure.

Description : After the sun rises, rapid heating of the air over the land compared to that over the ocean often causes of near surface air over the land. (a) Localized subsidence and high pressure. (b ... and high pressure. (c) Localized subsidence and low pressure. (d) Localized convection and low pressure.

Last Answer : (d) Localized convection and low pressure.

Subsidence results due to the constant or excess removal of ground water deplete the water table and increases the area of ____________. (A) Water table (B) Ground surface (C) Zone of saturation (D) Vadose zone

Description : Subsidence results due to the constant or excess removal of ground water deplete the water table and increases the area of ____________. (A) Water table (B) Ground surface (C) Zone of saturation (D) Vadose zone

Last Answer : (D) Vadose zone 

Abrupt uplift and gentle subsidence are indicative of: (A) Hat microatoll (B) Hemispherical coral head (C) Cup microatoll (D) Cylindrical coral head

Description : Abrupt uplift and gentle subsidence are indicative of: (A) Hat microatoll (B) Hemispherical coral head (C) Cup microatoll (D) Cylindrical coral head

Last Answer : (C) Cup microatoll  

What is the subsidence occurred at Great Nicobar Island due to 2004 Sumatra-Andaman earthquake? (A) 5 m (B) 3 m (C) 10 m (D) None of these

Description : What is the subsidence occurred at Great Nicobar Island due to 2004 Sumatra-Andaman earthquake? (A) 5 m (B) 3 m (C) 10 m (D) None of these

Last Answer : (B) 3 m 

Atolls are most probably formed by: w) a rise in the earth's crust x) sand brought in from the mainland y) collapse of the center of a volcano z) coral reef upbuilding during subsidence

Description : Atolls are most probably formed by: w) a rise in the earth's crust x) sand brought in from the mainland y) collapse of the center of a volcano z) coral reef upbuilding during subsidence

Last Answer : ANSWER: Z -- CORAL REEF UPBUILDING DURING SUBSIDENCE