# Calculate the residence time of strontium (Sr2+) in the world ocean, given that the average concentration of strontium in the world's rivers is approx. 0.89 umol L-1. (The concentration of (Sr2+) in the ocean is 0.092 mM, the total ocean volume is 1349.929x106 km3 , and the river input volume is 37.4x103 km3 yr-1 ).

Question

Calculate the residence time of strontium (Sr2+) in the world ocean, given that the average concentration of strontium in the world's rivers is approx. 0.89 umol L-1. (The concentration of (Sr2+) in the ocean is 0.092 mM, the total ocean volume is 1349.929x106 km3 , and the river input volume is 37.4x103 km3 yr-1 ).