Because traders had to travel and had more respect from Noble and kingly people
From my understanding of what i learned from middle school a volcano erupts when it creates enough lava to explode for example if you had a balloon that you were inflating too much eventually it will explode
The Prime Minister of the United Kingdom is appointed by the Queen, with agreement from the House of Commons (the elected members of Parliament). This is normally a mere formality and the leader of the party with the most seats generally gets appointed.
