With a country as big as Russia, it is hard to give you an accurate estimation. Siberia is known for some of the coldest winters in the world, reaching a very dangerous -35 degrees Celsius. The north pole of cold has a record breaking -69 degree celsius winters. over 65% of Russia is covered by permafrost. There is a humid continental climate as well.
The population of Oregon which is given above may also be expressed in scientific notation as,
4 x 10^6
The magnitude of this number is the exponent of 10 in the scientific notation. Thus, the answer is letter "B. 6".
It is a completely false statement that the top of a sedimentary layer was deposited before the bottom. The correct option among all the options that are given in the question is the second option or option "B". The top layer is always deposited later than the bottom layer. I hope the answer helps you.
