Bombs are melted volcanic rock that cooled and formed large pieces of rock when it was thrown out into the air before landing on the ground.
(volcanic rock; cooled; ) (Bombs; formed; large pieces of rock when it was thrown out into the air before landing on the ground) (it; was thrown; out; into the air; T:before landing on the ground) (it; before landing; L:on the ground)
volcanic rock Bombs it it
cooled formed was thrown before landing
large pieces of rock when it was thrown out into the air before landing on the ground
out into the air T:before landing on the ground
L:on the ground