[Mission 2024] STATIC QUIZ, 26 July 2023 – Geography

Solution: c)

Other factors influencing formation of deltas:

Amount and type of sediment available, Changes in coast level, Impacts of climate on growth of vegetation and marine organisms. Moreover, there should not be streams that cut at right angles, that could wash sediments away. Also, if any large lake is present, all sediment on way be deposited in the lake itself and the delta will not be formed.

Solution: b)

Normally, ocean currents are under the greater influence of prevailing winds. Indian Ocean currents are largely under the influence of monsoon – A seasonal reversal of winds.

Solution: c)

Solution: d)

Minerals can also form in several other ways:

• Precipitation from aqueous solution (i.e., from hot water flowing underground, from evaporation of a lake or inland sea, or in some cases, directly from seawater)
• Metamorphism — formation of new minerals directly from the elements within existing minerals under conditions of elevated temperature and pressure
• Weathering — during which minerals unstable at Earth’s surface may be altered to other minerals
• Organic formation — formation of minerals within shells and teeth and bones by organisms.

Hydrothermal deposits are produced when groundwater circulates to depth and heats up either by coming near a hot igneous body at depth or by circulating to great depth along the geothermal gradient.

Such hot water can dissolve valuable substances throughout a large volume of rock. As the hot water moves into cooler areas of the crust, the dissolved substances are precipitated from the hot water solution.

The velocity of flowing water determines whether minerals are carried in suspension or deposited. For e.g. when the velocity of the water slows, large minerals or minerals with a higher density are deposited.

Solution: b)