The 'Shivalik Hills', forming the outermost foothill range of the Himalayas, are composed primarily of:

💡 Solution & Explanation

The Shivaliks comprise poorly consolidated detrital sediments known as molasse, which were eroded from the rising Himalayas and deposited in long foreland basins. These soft formations make the hills highly vulnerable to landslides, soil erosion, and seismic activity. They represent the youngest geological subdivision of the Himalayan mountain system.