Rapidly moving water, when slowed, drops stones, then cobbles, pebbles, sand, and finally silt and clay.
(Rapidly moving water; slowed; ) (Rapidly moving water, when slowed; drops; stones) (Rapidly moving water, when slowed; cobbles; T:then)
Rapidly moving water Rapidly moving water, when slowed Rapidly moving water, when slowed
slowed drops cobbles
stones
T:then