useless trivia: What Word Means: To Cancel?

Questions

teichi igarashi climbed what mountain at the age of 99?

the gorbals is a district of which city?

the prefix tetra, used in such words as tetrach, tetrapod, & tetrameter, means what?

the straits of malacca separate malaysia from which country?

this statue was found on the greek island of melos in 1820?