The fastest and deepest geostrophic currents are found at the__________ boundaries of ocean basins.

Correct option is A

The fastest and deepest geostrophic currents are typically found at the western boundaries of ocean basins. These are called Western Boundary Currents and include currents such as the Gulf Stream in the North Atlantic and the Kuroshio Current in the North Pacific. These currents are intensified due to the Earth's rotation (Coriolis effect) and the configuration of ocean basins.
  Information Booster:
· Western Boundary Currents are fast, deep, and narrow ocean currents found on the western edges of ocean basins. These currents are intensified by the Coriolis effect, which increases as water moves from the equator towards the poles.
· These currents are important for transporting warm water from the tropics to higher latitudes, influencing global climate and weather patterns.
Additional Knowledge:
Eastern: Incorrect. Eastern boundary currents, such as the Canary Current or California Current, are typically slower, shallower, and broader than western boundary currents.
Equatorial: Incorrect. Equatorial currents, while important in ocean circulation, are not as fast or deep as western boundary currents.
Northern: Incorrect. Northern currents vary based on location, but they are not the fastest and deepest currents compared to western boundary currents.