Based on the clue 'a clue for alien astronomers looking for life on e...', what is the answer?

What is associated with: a cloud of ash circled the earth when most of this volcanic island was obliterated in an 1883… Based on the clue 'a cloudless sky coloured sneaker', what is the answer? Based on the clue 'a clovis point is a native american one', what is the answer? Based on the clue 'a clucking bunny advertises this companys creme eg...', what is the answer? Based on the clue 'a clue to umberto ecos murdered monks they have t...', what is the answer? Based on the clue 'a clumsy mistake such as one selected by dick clar...', what is the answer? What is referred to by 'a clumsy social error'? Based on the clue 'a cluster headache may center in these religious r...', what is the answer?