Misc: The study of the earth's physical divisions into mountains, seas, etc is ?

Questions

john lennon once visited which country artist in his las vegas dressing room and kissed his feet. who was he?

what duo had a hit with 'islands in the stream'?

who sang 'i will always love you'?

in 'war of the worlds', from which planet did the invaders come?

which city was the first to be surrounded by a wall?