Based on the clue 'at 15 on the modified mohs scale this substance st...', what is the answer?

What is associated with: at 14495 feet this peak is californias highest point? Based on the clue 'at 15 i set my heart on learning wrote this great ...', what is the answer? What is associated with: at 15 in 1991 judit polgar became the youngest person one of the few women to attain this rank? Based on the clue 'at 15 lady jane grey was imprisoned in this fortre...', what is the answer? Based on the clue 'at 15 ovids metamorphoses topped the length of thi...', what is the answer? Based on the clue 'at 15 she became the future louis xvis bride at 18...', what is the answer? Based on the clue 'at 15 she won a golden globe for my so called life...', what is the answer? What is associated with: at 15 years old in 1989 jack staddon won the first of these contests sponsored by national geo…