Why does all weather occur in the troposphere?

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.