What is the significance of these dates in the history section of the Russia Core: 1917 1945 1985 and 1991

Who developed the theory of plate tectonics?

The ethnic conflicts in darfur have led to an attempt to destroy a whole people known as

The distance a car travels between the time the driver decides to stop the car and the time the driver puts on brakes is called the reaction distance. how does the reaction distance change with speed? a. reaction distance decreases with with speed b. reaction distance stays the same with speed c. reaction distance increases with speed. d. there is not enough information to answer the question