around / all over the world

My 14 year old Japanese students are confused about 'around the world' and 'all over the world'.

Can anyone, using simple English, explain the difference if any?

My thoughts are that all over the world encompasses everyone and around the world would be more sporadic.

<<My thoughts are that all over the world encompasses everyone and around the world would be more sporadic. >>

Sounds reasonable to me, but in careless usage, these two could almost be synonymous.

Strictly speaking, "All over the world" would cover every location on earth:

"All over the world, gravity holds things down."

Around the world would mean that something exists in at least a few widely-separated places:

"Supervolcanoes are located around the world."

<<My thoughts are that all over the world encompasses everyone and around the world would be more sporadic. >>

Sounds reasonable to me, but in careless usage, these two could almost be synonymous.

Strictly speaking, "All over the world" would cover every location on earth:

"All over the world, gravity holds things down."

Around the world would mean that something exists in at least a few widely-separated places:

"Supervolcanoes are located around the world."

Thanks guest!

In the end, I told them to imagine a piece of string that went all around the world and a piece of paper that was all over the world.