Tectonically stable means that this part of the continent has not moved for billions of years. The rock formation is important understanding the history of Earth since its unmoved and untouched state can provide ideas about how the Earth looked like as seen on the layers of the rock formation.
It is used for transporting food i think and other things like oil for your hair and to brush your teeth and they use it in factories try one of them.
Artificial boundaries may overlap with traditional, cultural, or historic
boundaries and thus cause disagreements.
