[Mission 2023] STATIC QUIZ, 25 April 2023 – Geography

Solution: d)

• Alluvial soils are formed mainly due to silt deposited by Indo-Gangetic-Brahmaputra rivers. In coastal regions some alluvial deposits are formed due to wave action.
• Most of the soil is Sandy and clayey soils are not uncommon.
• Porosity and texture provide good drainage and other conditions favorable for agriculture.
• The proportion of Potash, phosphoric acid and alkalies are adequate
• The proportion of Iron oxide and lime vary within a wide range.

According to their age alluvial soils can be classified as old alluvial (Bangar) and new alluvial (Khadar). The bangar soil has a higher concentration of kanker nodules than the Khadar. It has more fine particles and is more fertile than the bangar.

Solution: d)

The Volcanic Explosivity Index (VEI) is a scale that describes the size of explosive volcanic eruptions based on magnitude and intensity. The numerical scale (from 0 to 8) is a logarithmic scale, and is generally analogous to the Richter and other magnitude scales for the size of earthquakes.

Philippine islands were created by volcanic activity caused by shifts in the plates that make up the Earth’s crust.

Volcanic soil is so fertile because it is derived from both volcanic lava and volcanic ash, both of which are rich in certain key nutrients, such as iron, calcium, magnesium, sodium, potassium, phosphorous, sulfur, silicon and many other trace elements, a rich combination that can act as a stimulant for plant growth.

Solution: c)

The Mount Kailash is situated in the western Tibetan plateau of the northernmost region of the Himalayas. Four rivers originate from Mount Kailash: the Indus, the Brahmaputra, the Karnali and the Sutlej.

Solution: c)

The shape of bays and estuaries along a coastline can also magnify the intensity of tides.

The position of both the sun and the moon in relation to the earth has direct bearing on tide height. When the sun, the moon and the earth are in a straight line, the height of the tide will be higher. These are called spring tides and they occur twice a month, one on full moon period and another during new moon period.

Normally, there is a seven-day interval between the spring tides and neap tides. At this time the sun and moon are at right angles to each other and the forces of the sun and moon tend to counteract one another.

Solution: a)

Tidal currents are the tides which are channelled between islands, bays and estuaries. Tidal current has significance in power generation.