The Marshall Plan (1948–1952) was a United States effort to assist the nations of Europe by
(1) Forming a strong military alliance (2) Providing economic aid
(3) Sending United States troops to trouble spots (4) Continuing Lend-Lease aid to the Soviet Union

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