Yes they can but they wouldn't have the concessions that they currently enjoy and they would have to use the Euro as their currency.
No, that would not be an issue arising from this.
YesAll members of the European Union have the right to leave.
It is secession
No, the UK will not leave the European Union, at least not any time soon.
Their main policy is that the UK should leave the European Union.
They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.They are people who do not support the European Union and think there are many flaws in it. The European Union is an organisation, but not everyone in each of the member country likes every aspect of it. Even some political parties in some countries do not favour aspects of membership of the European Union. There are 28 members, but not all of them use the Euro for example. So people or political parties that have problems with the European Union and do not like being in it and think it would be better to leave it are referred to as Euro sceptics. They are sceptical about the European Union.
The United Kingdom of Great Britain and Northern Ireland.
A country could have a referendum to ask its people if they want to leave. If the people voted for this, the country could then leave.
It is a geographical part of the continent of Europe, being off the mainland of Europe, so it has always been part of Europe and always will be, so the answer to your literal question is no. You are referring to the organisation called the European Union, which is a different thing that Europe. It could leave the European Union.
none
NO. As of 9 January 2016, Greece is a member of the European Union and still uses the euro.
Yes. The treaty that created the EU specifically allows members to leave if they choose.