Which term indicates mostly fine soils in slope movement?

The term that indicates mostly fine soils in slope movement is "Earth." This term is commonly used in geotechnical and geological contexts to refer specifically to soil materials that are predominantly composed of fines such as silts and clays.

In the context of slope movements, earth flows or earth slides are types of landslides that primarily consist of fine-grained materials. These movements can occur when saturated conditions weaken the cohesion and stability of these fine soils, leading to a flow or slide on a slope. The cohesion and plasticity of fine soils significantly contribute to the nature of these movements compared to coarser materials, which would exhibit different characteristics such as less plasticity and higher drainage capability.

Other terms, while they may refer to various types of materials involved in slope movements, do not specifically highlight the fine-grained nature of soils the way "Earth" does. Thus, "Earth" accurately describes the composition of soils related to this type of slope movement.