Which mechanism primarily controls the orientation of cirque-formed valleys within a glaciated mountain range?

💡 Explanation

When solar insolation varies across slopes, differential melting occurs causing nivation because slope aspect affects the duration and intensity of sunlight exposure. Therefore the direction valleys point is determined by insolation influencing snow accumulation not other options since the snow accumulation depends on sunlight exposure controlling its direction.

• Which mechanism initiates density-driven thermohaline circulation in the North Atlantic Ocean?
• Which outcome occurs when prolonged saturation weakens the foundation beneath a riverside levee?
• Which effect increases when vegetation is removed from a reinforced levee system along a major river?
• Which risk increases downstream from an artificially straightened meander resulting in an oxbow lake cutoff?
• Which process accelerates the lateral migration of a river's meander across an alluvial plain landscape?
• Which outcome occurs when flowing basaltic lava encounters groundwater?