Based on the clue 'about a quarter of the sun is a gas named for this...', what is the answer?

Based on the clue 'about 96 percent of mongols are of this religion', what is the answer? Based on the clue 'about a century ago londons south kensington museu...', what is the answer? Based on the clue 'about a mile from edinburgh castle this palace of ...', what is the answer? Based on the clue 'about a nation recovering from war the bookseller ...', what is the answer? Based on the clue 'about a tenth of estonias land area consists of is...', what is the answer? Based on the clue 'about a tenth of the earths surface is covered by ...', what is the answer? What is associated with: about a third of all life cereal sold is of this flavor introduced in 1978? Based on the clue 'about a third of nigerias states in this heavily m...', what is the answer?