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: LEISURE ACTIVITIES 
Clue: In origami, folding paper down, away from you, is a mountain fold; folding it up toward you is this opposite

SOLUTION: a valley

PROBLEM: Category: THERE WILL BE BLOOD SAUSAGE 
Clue: Popular Thuringer rotwurst from this country has been given geographic protection by the EU

SOLUTION: germany

PROBLEM: Category: PHYSICAL SCIENCE 
Clue: In 1911 Heike Onnes first observed superconductivity when he cooled this slippery element to -452 degrees Fahrenheit

SOLUTION:
mercury