What would happen to the Earth if all the water in the Pacific Ocean
disappeared or was suddenly evaporated?

1) Probably Al Qaeda would claim responsability
2) The fishes would be in trouble
3) Needing a new hobby, Malibu surfers would all get playstations
4) You'll take the LA-Tokyo express train
5) Japanese underwarter tunnels operators would go bankrupt
6) We could relocated the Kurds, Palestinains to the new dried up territories

Since the Pacific Ocean (and attached seas and bays) contains abour
55% of all sea-level water on the earth, the Atlantic, Indian, and
Arctic oceans would fill up the empty space dropping the global sea
level approximately 7,000 feet, doubling the amount of land area on
the globe!

You would also have massive evaporite percipitation deposits starting
with iron oxides through all the salts anhydite(CaCO3) (CaCO3+ 2H2O)
gypsum, sodium chloride (NaCl)sylvite ect!