How did the communists gain power in russia

Marine exptoration of oil uses seismic waves to locate oil in the seabed. what is a negative impact from seismic waves on the aquatic ecosystem of the ocean? a.seismic waves kill microoganisms b.seismic waves disrupts the sand and causes seafloor erosion c.seismic waves have virtually no adverse affects on marine life d.seismic waves damage the sonar that dolphins and whales use to orient themselves underwater

Why did stalin want control of eastern europe after ww2?

The idea that jews would return to palestine has been a part of jewish culture since the unsuccessful rebellion against the empire.