The correct answer is: Russia (although big parts of Russia are not in Eastern Europe but in Asia.
Russia has a huge territory which is generally very empty, especially in the North, where the conditions are harsh -there are only 150 million people in Russia, 10 million of which live in or near Moscow.
Use:
SOH - Sin(angle) = Opposite/Hypotenuse
CAH - Cos(angle) = Adjacent/Hypotenuse
TOA - Tan(angle) = Opposite/Adjacent
By remembering that you know that the answer is C for tangent.
From thousands to millions of years
The answer would be A) sea breezes
The Galapagos Islands are famous because it is where Charles Darwin discovered many previously unknown species of animals and inspired him to create the theories of natural selection, survival of the fittest, and evolution.