World history

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Across
  1. 5. Which river was most important to the development of ancient China?
  2. 7. The Roman Empire began in what is modern-day ___?
  3. 8. Who founded Christianity?
  4. 9. What helped protect the Italian Peninsula from invasion from the North?
  5. 10. What scientific test can be used to estimate the age of an object from the past?
  6. 11. What mountain range separated the Chinese and Indus civilizations?
Down
  1. 1. A group of nations under one government or ruler is most often known as a(n)
  2. 2. What country has many mountains, little arable land, and is an archipelago?
  3. 3. ___ is a term that describes everything that happened before the invention of writing.
  4. 4. What geographic feature protected ancient Greece, but also made it difficult to unite?
  5. 6. A person would be most likely to find silt after a ___.
  6. 12. What areas is between the Tigris and Euphrates river?