Which type of rock is more susceptible to erosion?

The correct choice identifies softer rock as more susceptible to erosion due to its physical and chemical characteristics. Softer rocks, such as limestone, sandstone, and shale, typically have a lower density and are less resistant to weathering and erosive forces. These rocks can be easily broken down by natural elements like wind, water, and ice, leading to a quicker rate of erosion.

In contrast, igneous and metamorphic rocks generally possess a denser structure that makes them more resistant to erosion. Igneous rocks, formed from cooled magma, often have a tough and crystalline formation. Metamorphic rocks have undergone transformation due to heat and pressure, enhancing their durability. Hard rocks, including granite and basalt, are also resistant to weathering due to their strong composition.

Understanding these characteristics helps recognize why softer rocks are more vulnerable and prone to erosion, making them a crucial subject of study in geography, particularly in discussions around landscape formation and environmental change.