Final answer:
Eastern boundary currents are relatively deep, narrow, and fast-moving ocean currents located near the eastern boundaries of continents. They can influence climate and marine ecosystems, but are not difficult for sailors to navigate.
Step-by-step explanation:
Eastern boundary currents are relatively deep, narrow, and fast-moving ocean currents that are located near the eastern boundaries of continents. These currents flow in the opposite direction of the prevailing winds and are influenced by the rotation of the Earth. They are not difficult for sailors to navigate, but they can have significant impacts on climate and marine ecosystems. One example of an eastern boundary current is the Gulf Stream, which carries warm water from the Gulf of Mexico along the eastern coast of the United States towards Europe.