Which one of our 50 states did we acquire through annexation? Why was it annexed?

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

There is no map, maybe give the link, it may be b

There is no map could you put up a picture of the map and i will try to .