Where did European cities develop during the Middle Ages? Choose three correct answers. Cities developed near trade routes.
Cities formed high in the mountains.
Cities developed near wide, open plains.
Cities formed on land where food could be grown.
Cities formed near water sources, such as rivers or channels.

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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

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