Option (A) is correct. The main cause of the convection currents in the asthenosphere is density and temperature.
Further Explanation:
The convection current in any medium is the shifting of the less denselayer upward and bringing the denser layers of the medium downward.
In other words, the convection current is set up when there is a significant variation in the density and the temperature of the different layers of the medium. The continuous movement of the warm layer up and the cold layer down leads to the convection current in the medium.
From the above explanation, it is clear that the convection current set up in any layer is due to the variation in the density and in the varying temperature range. The weight and the pressure of the layer do not play any significant role in setting the convection current.
Thus, Option (A) is correct. The main cause of the convection currents in the asthenosphere is density and temperature.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Heat transfer
Keywords: Asthenosphere, convection currents, density, temperature, warm layer, cold layer, dense, less dense, density and temperature.
