ice further break up the rocks with mechanical weathering, then the water washes the rock (now soil) away.
(ice; break up; the rocks with mechanical weathering, then the water washes the rock (now soil) away) (the water; washes; the rock; away; T:then)
ice the water
break up washes
the rocks with mechanical weathering, then the water washes the rock (now soil) away
the rock away T:then