What happens with a spell cast on an object when that object is later destroyed?

[Iku Rex]

What happens with a spell cast on an object when that object is later destroyed or damaged?

Examples:

A cleric casts daylight on a pebble and a few minutes later the pebble is crushed under a heavy boot. What happens to the spell?

A cleric casts silence on a tanglefoot bag and throws it at an opponent, causing it to come apart. What happens to the spell?

 

[Caliban]

What happens with a spell cast on an object when that object is later destroyed or damaged?

Examples:

A cleric casts daylight on a pebble and a few minutes later the pebble is crushed under a heavy boot. What happens to the spell?

One of the pebble pieces (probably the biggest piece) has the spell.

A cleric casts silence on a tanglefoot bag and throws it at an opponent, causing it to come apart. What happens to the spell?

It's still on the remains of the bag. The bag split and spilled the goo, but the bag was the target.

 

[knight_isa]

From the SRD: Magic items, unless otherwise noted, take damage as normal items of the same type. A damaged magic item continues to function, but if it is destroyed, all its magical power is lost.

Granted, you're not talking about permanent magical items, but I'd argue that the same general rules would apply.

In the case of the stone, I'd end the spell. Crushing the stone would effectively "destroy" it.

In the case of the tanglefoot bag, I'd leave the spell in effect, because the split bag would be damaged, but could potentially be repaired.