GIS technology makes updating maps easier than maps created manually.
Answer:
BBL
Explanation:
1 BBL = 42 US Gallons = 34.9726 Imperial Gallon = 158.987 Litres.
The standard volume unit for crude oil measurement, the 42-gallon barrel ("bbl"), dates back to the 1860s, when Pennsylvania producers actually stored and transported petroleum in wooden barrels.
I believe the basement is the best answer
Hope this helps!
I think it is the Prime Meridian
