The Volga is the largest river in Europe in terms of length, discharge, and watershed. It flows through the western part of Russia, and is widely viewed as the national river of Russia.

Correct Option: D

The Volga is the largest river in Europe in terms of length, discharge, and watershed. It flows through the western part of Russia, and is widely viewed as the national river of Russia.

The world’s largest coral reef is the Great Barrier Reef, located just off the northeastern coast of Australia. This coral reef system is composed of over 2,900 individual reefs and 900 islands.

Correct Option: B

The world’s largest coral reef is the Great Barrier Reef, located just off the northeastern coast of Australia. This coral reef system is composed of over 2,900 individual reefs and 900 islands.

Kalahari Desert: a large semi-arid sandy savannah in southern Africa; Atacama Desert: the driest hot desert in the world, located in South America,; Thar Desert: a large, arid region in the northwestern part of the Indian subcontinent, and Great Victoria: a sparsely populated desert area in Western Australia and South Australia.

Correct Option: D

Kalahari Desert: a large semi-arid sandy savannah in southern Africa; Atacama Desert: the driest hot desert in the world, located in South America,; Thar Desert: a large, arid region in the northwestern part of the Indian subcontinent, and Great Victoria: a sparsely populated desert area in Western Australia and South Australia.

Bass Strait is a sea strait separating Tasmania from the south of the Australian mainland, specifically the state of Victoria. Its maximum width is 240 km, its depth is 50–70 m.

Correct Option: A

Bass Strait is a sea strait separating Tasmania from the south of the Australian mainland, specifically the state of Victoria. Its maximum width is 240 km, its depth is 50–70 m.

Temperate grasslands, include the Prairie and Pacific Grasslands of North America, the Pampas of Argentina, Brazil and Uruguay, calcareous downland, and the steppes of Europe. The Pampas of South America are a grassland biome.

Correct Option: B

Temperate grasslands, include the Prairie and Pacific Grasslands of North America, the Pampas of Argentina, Brazil and Uruguay, calcareous downland, and the steppes of Europe. The Pampas of South America are a grassland biome.