In some cases, a large block of roc

In some cases, a large block of rock or soil, or sometimes
an entire mountainside, breaks away and slides downslope
as a coherent mass or as a few intact blocks. Two
types of slides occur: slump and rockslide.
A slump occurs when blocks of material slide downhill
over a gently curved fracture in rock or regolith (Fig.
13–12). Trees remain rooted in the moving blocks.
However, because the blocks rotate on the concave
fracture, trees on the slumping blocks are tilted backward.
Thus, you can distinguish slump from creep be-