The glacier picks up a lot of rocks when it moves forward, so there are rocks in the middle of the ice.
(The glacier; picks up; a lot of rocks; T:when it moves forward, so there are rocks in the middle of the ice) (it; moves; forward; so there are rocks in the middle of the ice)
The glacier it
picks up moves
a lot of rocks T:when it moves forward, so there are rocks in the middle of the ice
forward so there are rocks in the middle of the ice