What characteristic of solid rock makes it stable?

Solid rock possesses a characteristic of resistance to erosion, which significantly contributes to its stability. This resistance means that solid rock can withstand various natural forces, such as wind, water, and ice, without breaking down or being significantly altered over time.

Erosion typically wears away weaker materials more easily, whereas solid rock, due to its density and structural integrity, remains intact even in challenging environmental conditions. This stability is essential for maintaining landscapes, supporting infrastructure, and providing a reliable foundation for structures. In terms of construction and civil engineering, recognizing the stability offered by solid rock allows for safer and more effective planning and execution of projects.

Other characteristics, such as high moisture content, low density, and flexibility, do not contribute to the stability of solid rock in the same way. High moisture content, for instance, might weaken materials, while low density could imply the rock is more susceptible to erosion. Flexibility suggests the ability to bend or yield, which is contrary to the principles of stability required for solid rock.