The Yellow River or Huang He, formerly spelt Hwang Ho is the second-longest river in China after the Yangtze and the sixth-longest in the world. The Yellow River is called "the cradle of Chinese civilization.” Hwang Ho is called Yellow River because of the high volumes of sediment in it.

Correct Option: A

The Yellow River or Huang He, formerly spelt Hwang Ho is the second-longest river in China after the Yangtze and the sixth-longest in the world. The Yellow River is called "the cradle of Chinese civilization.” Hwang Ho is called Yellow River because of the high volumes of sediment in it.

The Strait of Gibraltar is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Gibraltar and Spain in Europe from Morocco in Africa.

Correct Option: D

The Strait of Gibraltar is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Gibraltar and Spain in Europe from Morocco in Africa.

The Gulf Stream, together with its northern extension towards Europe, the North Atlantic Drift, is a powerful, warm, and swift Atlantic ocean current that originates at the tip of Florida, and follows the eastern coastlines of the United States and Newfoundland before crossing the Atlantic Ocean. It influences the climate of the east coast of North America from Florida to Newfoundland, and the west coast of Europe.

Correct Option: A

The Gulf Stream, together with its northern extension towards Europe, the North Atlantic Drift, is a powerful, warm, and swift Atlantic ocean current that originates at the tip of Florida, and follows the eastern coastlines of the United States and Newfoundland before crossing the Atlantic Ocean. It influences the climate of the east coast of North America from Florida to Newfoundland, and the west coast of Europe.

The Pacific Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. It has 452 volcanoes and is home to over 75% of the world's active and dormant volcanoes. About 90% of the world's earthquakes and 81% of the world's largest earthquakes occur along the Ring of Fire.

Correct Option: B

The Pacific Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. It has 452 volcanoes and is home to over 75% of the world's active and dormant volcanoes. About 90% of the world's earthquakes and 81% of the world's largest earthquakes occur along the Ring of Fire.

The Caspian Sea is generally regarded as the world's largest lake, but it contains an oceanic basin rather than being entirely over continental crust. Lake Superior is the largest freshwater lake in the world in area.

Correct Option: B

The Caspian Sea is generally regarded as the world's largest lake, but it contains an oceanic basin rather than being entirely over continental crust. Lake Superior is the largest freshwater lake in the world in area.