...to become something else
turn into
...an important part of rocks
mineral
...not alive
dead
...to break down
rot
...highest in position
top
...the gas that we breathe
air
...to keep in place
hold
...in all places
everywhere
...at a lower place
below
...a mix of rotting stuff and soil
humus
...not the same
other
...having a special use
important
