What happened during the Russian Revolution? A.
Mikhail Gorbachev instituted social and political reforms.
B.
The Soviet Union was dissolved into 15 independent nations.
C.
Vladimir Lenin and the communists overthrew the Russian tsar.
D.
Joseph Stalin made widespread cultural and economic changes

How does rain water cause erosion and deposition? a. when acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves.b. when a river overflows it moves downhill resulting in the formation of caves.c. when it rains, water flows into rivers and streams and moves back to land, resulting in the formation of caves.d. when water empties into lakes, sediment is deposited, resulting in formation of caves.