WW1 history help needed?

I need help with a few questions.

Europe in World War 1
1.What nation set up a naval blockade and mined the North Sea?
2. A revolution in 1917 forced what nation to leave the war?
3. In 1914, the German army invaded Belgium on its way to what nation?

Who all were apart of the allies, and who were apart of the central powers during this time?

If you know of a website with great maps during and after ww1 please list them.

Thank-you
 
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