I believe they were both harmed by nuclear radiation. Hiroshima was when the USA bombed Japan with a nuclear bomb. Chernobyl is the disaster in which a reactor caught fire and caused the harmful radiation to spread. I hope that was helpful. :)
Answer:
To unite such a vast empire, Persian rulers relied on sophisticated infrastructure, centralized government, and a well-developed bureaucracy.
Explanation:
I think it might be the Dudh Kosi river
Answer:
The mountains isolated Greeks from one another, which caused Greek communities to develop their own way of life. Greece is made up of many mountains, isolated valleys, and small islands. This geography prevented the Greeks from building a large empire like that of Egypt or Mesopotamia
