What happens to the conch and to Piggy?

Answer 1

When Roger launched the boulder from the top of Castle Rock "with a sense of delirious abandonement," it struck Piggy a "glancing blow" and the conch "exploded into a thousand white fragments and ceased to exist." Piggy then travelled sideways through the air and fell forty feet to land on his back on the square rock in the sea. "His head opened and stuff came out and turned red."

Answer 2

Piggy was holding the conch when he addressed Jack's tribe from the causeway leading to castle rock. Roger, who was on guard duty on top of castle rock, leaned on a lever which was wedged under a boulder simply becasue he wanted to. The boulder crashed down onto the causeway, hitting Piggy with a glancing blow that shattered the conch and sent Piggy flying through the air, to land on a rock in the sea, where his brains were spilled by the force of the impact.

Answer 3

When Roger sends the boulder crashing down from Castle Rock it hits Piggy with a glancing blow and knocks him over the edge of the cliff. Piggy is killed and the conch is smashed to pieces.
Piggy get crushed by a HUGE boulder pushed by Roger, and Piggy happen to have the conch in his hand at the time. Piggy died, and the conch was destroyed