One of the most common methods to date volcanic rocks uses potassium radioactive parent and argon stable daughter).
The EU is a political and economic union of 28 countries, which developed an internal single market through a standardised system of laws. Politically, these 28 countries are linked by the European Parliament, the European Commission, the Council of Europe and the European Council (the last two have similar names, but they have different functionalities). Economically, by the ECB - the European Central Bank. Monetarily, by the Eurozone and the currency EURO, which is present in 19/28 countries. Also, there's a Schengen area, where passports are abolished and you can travel freely, BUT not all the countries that are in the EU, are in Schengen area (ex. Romania, Bulgaria); and vice-versa: Norway is not in the EU, but is part of the Schengen area.
I hope I helped, I used to have a "map" of interactions of all these countries in different unions/institutions, but cannot find it. If you need one to help you understand the EU better, tell me and I'll intensively look for it!
Update: here's the map.
Answer:
two positive effects of British rule in India climate and diseases.
The correct answer is B) Federalism.
Dividing power between the state and national levels is known as "Federalism."
The framers believed in the principle of Federalism that is the system of government where power is divided between a central government and regional governments. The framers of the U.S. Constitution granted some faculties to the national government and granted others to the states.
The framers respected the states because they were already functioning one way or the other the people of that time were font to their states.
In other words, when we talk about United States politics, the principle of federalism refers to that the power of the government is shared by the state governments and the federal government.
This power functions under a system of checks and balances in which none of the branches of the government was more powerful than the other two. In the US government system, when federal law conflicts with state law, the federal law will win. This is included in the Constitution as the Supremacy Clause.