What's happen if our land become a sea and our sea become a land?

Just move to the land.

Well if the land became the sea and the sea became land then assuming alot of water would dissapear in the process then the climate of the earth would shift greatly, with less surface area for the water we could expect alot of droughts and famine.

i like water...

You would get wet..

all sea creatures would just about die, and humans would swim towards the land. not many animals would survive, because not many would be able to swim.

Then there will be fightings amongst those who wants bigger land area for the future development of their countries... We got lesser beach to go to for our holidays....

Mass confusion and destruction.

Then you become a fish. The largest ocean will be Russia, and the largest continent will be the Pacific.

then we can save an awful lot of time trying to build more land. singapore will be real happy :P