Radioactive uranium decays into lead. What relative amount of uranium and lead would you expect to find in the oldest rocks?
Very little uranium and very little lead
A lot of uranium and very little lead
Very little uranium and a lot of lead
A lot of uranium and a lot of lead

Consider the following invention from the american industrial era. cotton gin – a machine that removed seeds from short-staple cotton which option explains how this invention contributed to the role of the united states as an emerging world power? a. it was in high demand abroad, as many european nations had begun farming cotton. b. it led to the decline of slavery in the south, which enhanced america’s international reputation. c. it freed up many slaves to become factory workers in northern cities, which improved the economy. d. it increased production efficiency of a us cash crop that was in high demand in other nations.