one of the decay products of 238u is 226ra . a rock originally contained 238u , which has a half-life of 4.5×109 yr, and 226ra , which has a half-life of 1,600 yr. after 5×109 yr, which isotopes would you expect to be present in significant amounts in the rock?

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

answer seismograph;