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Q91. In which river type does helical flow play an important role in controlling morphology?
Helical (corkscrew) flow in meander bends erodes the outer bank and deposits point bars on the inner bank.
Q92. Three pixels P, Q, R have NDVI values +0.84, +0.01, -0.89. Identify them.
High positive NDVI (+0.84) indicates healthy vegetation. Low positive (+0.01) indicates barren soil. Negative (-0.89) indicates water.
Q93. Characteristics of HIMU mantle reservoir:
HIMU stands for 'High Mu' (High U/Pb ratio), which leads to very radiogenic Lead isotope ratios (High 206Pb/204Pb).
Q94. A metamorphic rock consists of pyroxene, plagioclase and quartz, and exhibits hornfelsic texture. The rock has undergone:
Hornfelsic texture (non-foliated, granular) is characteristic of high-temperature, low-pressure Contact Metamorphism. Regional metamorphism typically produces foliation.
Q95. In a remotely sensed data of a planet, the presence of hydrous species can be inferred using which region of the electromagnetic spectrum?
Hydrous minerals have distinctive absorption features in the infrared (IR) region, particularly in the Short Wave Infrared (SWIR).
Q96. Two vertically dipping limbs of a fold have perpendicular strikes. The fold can be classified as:
If limbs are vertical and strikes are perpendicular, the fold axis must be vertical (plunge of 90 degrees), making it a vertical fold.
Q97. International Geomagnetic Reference Field (IGRF) is used in processing regional magnetic data to remove:
IGRF models the Earth's main magnetic field generated by the core. Subtracting it removes long-term (secular) changes, leaving local anomalies.
Q98. According to Airy's model, gravity anomalies for fully isostatically compensated topography are characterized by:
In Airy isostasy, high topography is supported by a deep low-density crustal root, causing a mass deficit relative to the mantle, which appears as a negative Bouguer anomaly.
Q99. Which statement is CORRECT for the amphibole glaucophane?
In Glaucophane (Na2Mg3Al2Si8O22(OH)2), Sodium occupies the M4 site, Aluminum occupies the M2 octahedral site, and Silicon fills the tetrahedral sites.
Q100. The most volcanically active body in our Solar System is:
Io, a moon of Jupiter, is the most volcanically active body due to intense tidal heating from Jupiter's gravity.