Question

question 2 (20 points)
listen
many hill - slope masses are weak due to preexisting geologic conditions such as

all of these choices are correct
rock layering dipping less than topographic slopes
structures within the rocks, such as fractures, ancient faults, and thin clay seams
ancient slide surfaces

Explanation:

• Rock layering dipping less than topographic slopes can create instability as the layers may not be able to support the slope properly.
• Structures within rocks like fractures, ancient faults, and thin clay seams weaken the rock mass. Fractures and faults are planes of weakness, and clay seams (which can be slippery when wet) reduce the shear strength.
• Ancient slide surfaces are pre - existing zones of weakness. If they are reactivated or if the overlying material is unstable with respect to them, the hillslope mass can be weak.

Since all these factors contribute to the weakness of hill - slope masses, the "All of these choices are correct" option is valid.

Answer:

All of these choices are correct