Based on the clue 'at 3 12 million square miles this largest desert c...', what is the answer?

Who performed with 'at 282 feet below sea level its californias and the usas lowest point'? What is associated with: at 28374 feet the puerto rico trench is this oceans deepest point? Based on the clue 'at 288 square miles sao miguel is the largest of t...', what is the answer? Based on the clue 'at 29 feet 4 12 inches mike powell holds the world...', what is the answer? Based on the clue 'at 3 times proportional size of any other primate ...', what is the answer? Based on the clue 'at 30 years this pbs series from the austin music ...', what is the answer? What is referred to by 'at 30'? What is associated with: at 3031 miles in diameter this planet is the second smallest in our solar system?