Answer:
true. I think it's helpfull
This is a timeline of Russian history, comprising important legal and territorial changes and political events in Russia and its predecessor states. To read about the background to these events, see History of Russia. See also the list of leaders of Russia.
Dates before 31 January 1918, when the Bolshevik government adopted the Gregorian calendar, are given in the Old Style Julian calendar.
The renewable energy source is Hydroelectricity.
The layers get more dense as you travel towards the core of the Earth.
