Slavery was more prevalent in South Carolina than in North Carolina because settlers of South Carolina came from plantations in Barbados and settlers of North Carolina usually had small farms. Another factor why slavery was common in the Carolinas was because the colonists in the Carolinas came from the Caribbean, where slavery was common.
One of them is Norway (385,155km²) ...
The statement is correct.
The contour lines are a very good indicator of the relief. The closer they are to one another, the steeper the relief, and vice verse, the more distant they are from one another, the flatter the relief is.
In general, contour lines that are very close to each other can be noticed on the mountains, as most of the mountains have steep parts, or rather steeper slopes.
The more distant contour lines, on the other hand, can be found on places like the valleys or the plateaus, places that in general are much flatter.
Dallas, TX, the US
Latitude and longitude coordinates are: 32.779167, -96.808891.