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Q81. The metamorphic facies diagnostic of a subduction zone is:
Subduction zones create unique High-Pressure/Low-Temperature conditions, which lead to the formation of Blueschist facies rocks.
Q82. It takes approximately how many minutes for sunlight to reach the Earth?
Sunlight takes about 8 minutes and 20 seconds to travel the distance from the Sun to the Earth.
Q83. The S-wave shadow zone of the Earth ranges from:
S-waves cannot travel through the liquid outer core, creating a shadow zone from 103 degrees on one side to 103 degrees on the other (effectively 103-180).
Q84. Which one of the following is a chronostratigraphic unit?
'System' refers to the actual rock strata deposited during a specific time interval. Eon, Period, and Era are geochronologic (time-only) units.
Q85. Which of the following statements is TRUE for the temperature variation with altitude in the earth's atmosphere?
Temperature rises in the stratosphere due to ozone absorbing UV radiation, but drops in the mesosphere as ozone concentration decreases.
Q86. An active trench is present in the vicinity of:
The Andaman & Nicobar islands lie along the convergent boundary where the Indian Plate subducts, forming an active trench.
Q87. An active trench is present in the vicinity of:
The Andaman & Nicobar islands lie along the convergent boundary where the Indian Plate subducts, forming an active trench.
Q88. The continuous series of Bowen's reaction series is represented by:
The continuous branch describes the evolution of plagioclase feldspar from Ca-rich (Anorthite) to Na-rich (Albite) as magma cools.
Q89. In seismic refraction surveys, the critical distance is:
The critical distance is where the refracted wave first reaches the surface. The crossover distance is where the refracted wave overtakes the direct wave (which happens further out).
Q90. In the geological map of India, which one of the following geological units has the largest area?
The Deccan Volcanic Province covers a vast area of Peninsular India (originally >1.5 million sq km, currently ~500,000 sq km), larger than the other listed units.