Which nations are run by a prime minister?

Nations that have parliamentary or semi-presidential system of government are run by a Prime Minister.

Countries with Parliamentary systems have a Head of State and a Head of Government. The Parliamentary system may be Constitutional Monarchies like United Kingdom, Sweden, and Japan or Parliamentary Republic like Ireland, Germany, India, and Italy.

Prime Ministers are the Heads of Government whereas Heads of State hold only a ceremonial position with its reserved powers. 

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.