The Gulf Stream is a warm current that originates in the Gulf of Mexico and moves north toward Europe. Since it is full of warm water, the sea surface temperatures are warm, which keeps places like Europe warmer than other areas at similar latitudes.

Correct Option: D

The Gulf Stream is a warm current that originates in the Gulf of Mexico and moves north toward Europe. Since it is full of warm water, the sea surface temperatures are warm, which keeps places like Europe warmer than other areas at similar latitudes.

Eutrophication is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic system. One example is the "bloom" or great increase of phytoplankton in a water body as a response to increased levels of nutrients.

Correct Option: A

Eutrophication is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic system. One example is the "bloom" or great increase of phytoplankton in a water body as a response to increased levels of nutrients.

The eastward continuation of the Brazil Current is called the South Atlantic Drift. It is also known as the West Wind Drift because it forms at 400 South latitude due to the impact of the Westerlies. The eastward movement is due to the Earth’s rotation.

Correct Option: A

The eastward continuation of the Brazil Current is called the South Atlantic Drift. It is also known as the West Wind Drift because it forms at 400 South latitude due to the impact of the Westerlies. The eastward movement is due to the Earth’s rotation.

The Sargasso Sea is a region in the gyre in the middle of the North Atlantic Ocean. The Sargasso Sea is home to seaweed of the genus Sargassum (origin of its name), which floats en masse on the surface there.

Correct Option: A

The Sargasso Sea is a region in the gyre in the middle of the North Atlantic Ocean. The Sargasso Sea is home to seaweed of the genus Sargassum (origin of its name), which floats en masse on the surface there.

El Nino occurs over Pacific Ocean. El Nino is a southerly, warm ocean current.

Correct Option: C

El Nino occurs over Pacific Ocean. El Nino is a southerly, warm ocean current.