Which great mountain chain separates the northern european plain from the west siberian plain and forms the dividing line between european and asia?

What was the turning point for the soviets allowing them to regain power and turn back the germans?

Why did william blackstone believe that parliament was important?

Jackson pollock described his art style in the following quote: “new needs need new techniques.… it seems to me that the modern painter cannot express this age, the airplane, the atom bomb, the radio, in the old forms of the renaissance or of any other past culture. each age finds its own technique.” what point is pollock making about the new styles of art?