Fossils are formed when a living thing dies, and some part of it lies on the ground and is covered over by sand or mud.
(Fossils; are formed; T:when a living thing dies) (a living thing; dies; ) (some part of it; lies; on the ground) (some part of it; is covered over; by sand or mud)
Fossils a living thing some part of it some part of it
are formed dies lies is covered over
T:when a living thing dies
on the ground
by sand or mud