During the Winter and early Spring, rain water entering fractures in the rock freezes and thaws, causing small and large slabs of rocks to become dislodged and move down slope toward the highway.
(rain water; entering; fractures; L:in the rock freezes and thaws) (the rock freezes and thaws; causing; small and large slabs of rocks)
rain water the rock freezes and thaws
entering causing
fractures L:in the rock freezes and thaws
small and large slabs of rocks