TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: SWITZERLAND 
Clue: Swiss banks store heaps of gold in vaults below the Bahnhofstrasse, an elegant street in this city

SOLUTION: zurich

PROBLEM: Category: ELEMENT NAMES 
Clue: In 1828 a Norse god thundered onto the periodic table in the name of this element, No. 90

SOLUTION: thorium

PROBLEM: Category: GEOLOGY 
Clue: It's believed that a land mass called Pangaea later split into 2: Laurasia & this one

SOLUTION:
gondwanaland