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.

Q: Category: O FOR A 
Clue: Completely humble yourself for small stones & pebbles

A: grovel for gravel
****
Q: Category: COLORFUL RHYME TIME 
Clue: Blushing writing liquid

A: pink ink
****
Q: Category: NATIONAL GEOGRAPHIC 
Clue: The dry valleys offer some unusual views of this continent

A:
antarctica
****