Loose rock fragments can be caused by weathering, or indeed erosion. They can be found in a scree slope, and alluvial fan, a beach, in the soil (they are the soil, sometimes).
Loose rock fragments are known to a geologist as 'Unconsolidated sediment' which can be classified into various groups. Consider alluvium; the deposit from a river.
ice and loose rocks
Loose rock material is called detritus.
Detrital rocks are formed from sedimentation of loose particles of rocks that are worn away from rocks from a different location.
Sand.
Unconsolidated means loose if consider rocks
They're called clastic sedimentary rocks.
When older rocks, plants, and other loose material get pressed or cemented together
sedimentary rocks are formed
ice and loose rocks
It is a mudslide!
Sedimentary rocks form as pieces of loose material get pressed or cemented together. The process of forming sedimentary rocks is lithification.
Sedimentary rocks are formed in this substance