Final answer:
The relationship between Richard Trevithick inventing the first railway steam locomotive and Britain having more than 6,000 miles of railroad track by 1850 is an example of causation.
Step-by-step explanation:
The relationship between Richard Trevithick inventing the first railway steam locomotive in the early 1800s and Britain having more than 6,000 miles of railroad track by 1850 is an example of causation. Causation refers to the cause-and-effect relationship between two events, where one event directly leads to the other.
In this case, Trevithick's invention of the steam locomotive directly led to the rapid expansion of railroad tracks in Britain. The steam locomotive provided a more efficient and faster mode of transportation, which made it economically viable to build more railroad tracks.
This development revolutionized transportation during the Industrial Revolution, allowing for the efficient movement of goods, people, and ideas.