[Mission 2023] INSIGHTS STATIC QUIZ, 1 July 2022 – Geography – INSIGHTSIAS

Solution: c)

Constant eruptions at the crest of oceanic ridges cause the rupture of the oceanic crust and the new lava wedges into it, pushing the oceanic crust on either side. The ocean floor, thus spreads, known as sea floor spreading.

Sea floor spreading is verified using these phenomena:

• It was realised that all along the mid-oceanic ridges, volcanic eruptions are common and they bring huge amounts of lava to the surface in this area. The sediments on the ocean floor are unexpectedly very thin.
• The age of the rocks increases as one moves away from the crest.
• The ocean crust rocks are much younger than the continental rocks.
• The sediments on the ocean floor are unexpectedly very thin.
• The deep trenches have deep-seated earthquake occurrences while in the mid-oceanic ridge areas, the quake foci have shallow depths. It means lava is in close vicinity.

Solution: b)

An anti-cyclone — also known as a high pressure area — is a large atmospheric circulation system with the wind flowing clockwise around it in the Northern Hemisphere, and counter-clockwise in the Southern Hemisphere. 

loudy conditions and precipitation exists at the periphery of anticyclones.

Solution: b)

It is found in Aravali Mountains, two-thirds of the Deccan peninsula and some parts of north east. 

These rocks have abundant metallic and non-metallic minerals such as iron, copper, manganese, bauxite, lead, zinc, gold, silver, tin, tungsten, mica, asbestos, graphite, etc.

These are the oldest followed by Dharwar rocks. Tertiary rocks are the youngest. 

Solution: c)

A Western Disturbance is an extra-tropical storm originating in the Mediterranean region that brings sudden winter rain to the north-western parts of the Indian subcontinent. It is a non-monsoonal precipitation pattern driven by the westerlies. The moisture in these storms usually originates over the Mediterranean Sea and the Atlantic Ocean

Western Disturbances are important for the development of the Rabi crop, which includes the locally important staple wheat.

Solution: c)

Atmospheric Pressure: force exerted by the weight of the air. Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air molecules above that surface.

Isobars are imaginary lines that connect points of equal atmospheric pressure on a given day. Pressure gradient force is what determines the strength of winds.

Isobars that are widely spaced apart indicate gently blowing winds (pressure gradient force is low).

Isobars that are closely spaced together indicate strong winds (high pressure gradient).

The Coriolis force, caused by the spin of the Earth, determines that moving air masses in the northern hemisphere deflect to the right. It is the opposite in the southern hemisphere.