What did spain do after the american revolution to discourage american settlements west of the appalachian mountains

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 are nation-states difficult to create?

Knights are to chivalry what samurai are to a. bushido c. buddhism b. shinto d. none of these select the best answer from the choices provided a b c d