True it is in a particular time in the past
It seems you need to move the decimal three times over, then you round the number. So the answer would be 5.5 x 10^3.
Caspian Sea is what I got
I think the correct answer from the choices listed above is the second option. An example of folded mountains can be seen in the Alps in Europe. <span>Fold mountains are mountains formed mainly by the effects of folding on layers within the upper part of the Earth's crust. Hope this answers the question.</span>
