Which of Zheng He, Vasco da Gama, or Christopher Columbus was the greatest 15th century mariner, and why? Give at least two pieces of evidence to support
your answer.

Which of the following is most likely the biggest result of the women’s rights movement

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

Think local—how is the lawmaking process at a local level different from the state or federal government? use complete sentences.