useless trivia: What Word Means: A Zend-avesta Prayer Book?

Questions

of what is the word 'fortnight' a contraction?

what is a wind with a speed of 74 miles or more?

what is the 13.5 ton chime on london's tower clock?

what were more than 99.9% of all the animal species that have ever lived on earth before the coming of man?

10' of what equals 1' of rain in water content?