Question

In which type of geological formation are gorges most commonly developed?

• A. Soft sediment
• B. Hard rocks
• C. Glacial till
• D. Volcanic ash

Answer 1

Answer:

B. Hard rocks

• Hard Rocks: Gorges are most commonly developed in hard, resistant rocks such as granite, basalt, or sandstone. These rocks are less susceptible to weathering and erosion, allowing rivers to cut deep, vertical channels over long periods.

• Uplift and Tectonic Activity: Tectonic uplift can increase the gradient of a river, enhancing its erosive power and leading to the formation or deepening of gorges.

• Differential Erosion: Variations in rock hardness within a geological formation can lead to differential erosion, where softer rock layers are eroded more quickly than harder ones, creating steep valley sides.