Convection is a process which transfers the heat between the temperatures when fluid (i.e. liquid or gas) is in motion. Due to the presence of heat source, water temperature increases and also it will become less dense and rise. Hot air is less dense than cold. When air rises higher in the atmosphere its pressure gets down and it becomes colder.
Answer: A "The Decrease in trade among societies
Explanation:
As cities grow, s does their impact on other societies. In order to grow more, cities need to trade materials they have abundance in for materials they don't
The answer is Athens or letter a. The Athenians were a sea-faring race and they
had major ports that they used for trade.
They traded with other countries and this helped contribute to the
growth of Athens’ growth a state which later led to her Golden Age.