Question

what is shown in the image below? these failure surfaces form parallel to the slope in a granitoid.

spheroidal weathering

bedding planes

exfoliation joints

foliation planes

Explanation:

• Spheroidal weathering: It is a type of chemical weathering that results in rounded or spherical shapes of rocks, not related to failure surfaces parallel to slope.
• Bedding planes: These are surfaces between sedimentary rock layers, not relevant here as the rock is granitoid (igneous).
• Exfoliation joints: Occur in igneous rocks (like granitoid) due to pressure release. They form curved surfaces parallel to the slope or outer surface of the rock mass.
• Foliation planes: Associated with metamorphic rocks, showing planar alignment of minerals, not applicable for granitoid in this context.

Answer:

Exfoliation joints