Yes, it can, especially if the pool is cool and you are on diuretics already. If this is the case, make sure you drink water at least once every half an hour when swimming, to avoid dehydration. Also, keep in mind that immersion in water does not replace the need to drink water!
It would cause excessive mud and the swimming pool would sink slightly. It would only cause a sinkhole if there was a hole underground under the pool.
No
yes
cause your an idiot
being compressed
More likely it will cause the surrounding decking to shift. Pols usuall "pop" from being empty.
No. At least, I think so...
cause most people have an accident in a pool
No, but it could cause similar appearing skin irritations.
chlorine can cause that and if a lot of sun is taken during the pool hours the peeling of the sking can also cause the itch.
'Swimming Pool', sometimes shortened to 'Pool'.
It depends on how high you dropped the glass jar into the swimming pool. If you drop the glass jar from a few feet above the swimming pool, it will not break. If you drop it from several stories above the swimming pool, the immense pressure on the glass jar that the water is exerting will cause the jar to break.