I believe it's the steam engine unsure with out answer choices <span />
Population density is the number of people that live in a region, divided by a specific measurement such as square miles or square kilometers.
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Answer:
The surface area of the Earth is 510 million square kilometers
Answer:
Scots-Irish
Explanation:
Scotch-Irish or Scots-Irish may refer to: The Ulster Scots people, an ethnic group in Ulster, Ireland, who trace their roots to settlers from Scotland. Scotch-Irish Americans, descendants of Ulster Scots who first migrated to America in large numbers in the 18th and 19th centuries.