Deserts & Grasslands — Set 4

Correct Answer: C. Namib Desert

• **Namib Desert** = coastal desert stretching along the Atlantic coast of southwestern Africa (primarily Namibia), receiving moisture through coastal fog. • **Oldest desert** — the Namib is possibly 55-80 million years old, making it one of the world's oldest deserts; it contains some of the world's tallest sand dunes at Sossusvlei. • 💡 Wrong-option analysis: Atacama Desert: in southwestern South America (Chile), not Africa; Thar Desert: in northwestern South Asia (India-Pakistan), not Africa; Sonoran Desert: in North America (southwestern USA-northwestern Mexico), not Africa.

Correct Answer: D. Veld

• **Veld** = wide-open grassy plains of Southern Africa, particularly in South Africa, characterized by temperate climate, vital for the livestock industry. • **Highveld and Bushveld** — the South African Veld includes Highveld (high plateau), Lowveld, Bushveld, and Karoo; the Highveld around Johannesburg is the most economically significant. • 💡 Wrong-option analysis: Downs: temperate grasslands in Australia's Murray-Darling basin; Steppes: temperate grasslands of Eurasia (Eastern Europe-Central Asia); Prairies: temperate grasslands of central North America.

Correct Answer: A. Sonoran Desert

• **Sonoran Desert** = arid region in southwestern USA and northwestern Mexico, uniquely biodiverse, the only place where the giant Saguaro cactus grows wild. • **Saguaro cactus** — the Saguaro (Carnegiea gigantea) can live up to 200 years and grow up to 12 m tall; it is the state flower of Arizona and grows ONLY in the Sonoran Desert. • 💡 Wrong-option analysis: Atacama Desert: in northern Chile, extremely dry, very limited plant life; Gobi Desert: in China-Mongolia, cold desert, no cacti; Gibson Desert: in Western Australia, no Saguaro cactus (cacti are native to the Americas).

Correct Answer: D. Hungary

• **Puszta** = vast temperate grassland on the Great Hungarian Plain in Hungary, representing alkali steppes and wetlands, a UNESCO World Heritage site (Hortobágy). • **Hortobágy National Park** — the Hortobágy National Park is the largest semi-natural grassland in Europe and was the first Hungarian site added to the UNESCO World Heritage List (1999). • 💡 Wrong-option analysis: France: has Alps and temperate forests; its grasslands are not specifically named 'Puszta'; Italy: has the Po Valley and Mediterranean maquis; Greece: has Mediterranean shrublands and the Thessaly plains.

Correct Answer: C. Gobi Desert

• **Gobi Desert** = largest cold desert in the world outside polar regions, spanning northern China and southern Mongolia, with extreme temperature fluctuations. • **1.3 million sq km** — the Gobi Desert covers approximately 1.3 million sq km; temperatures range from -40°C in winter to +50°C in summer; famous for dinosaur fossils and Bactrian camels. • 💡 Wrong-option analysis: Sahara Desert: the world's largest HOT desert (9.2 million sq km) in North Africa; Atacama Desert: the driest desert on Earth in South America, a coastal hot desert; Arabian Desert: the largest desert in Asia (2.3 million sq km), a hot desert on the Arabian Peninsula.

Correct Answer: B. Pebbles and gravel

• **Reg** = stony desert plain covered with closely packed pebbles and gravel, formed by wind removal of finer sand particles; much of the Sahara is Reg rather than sand dunes. • **Erg vs. Reg** — only about 25% of the Sahara consists of sand dunes (Erg); the majority (about 70%) is stony Reg or bare rocky Hammada; this is a common misconception. • 💡 Wrong-option analysis: Shifting sand dunes: these form the 'Erg' desert type, covering only ~25% of the Sahara; Fertile silt: found in river deltas and floodplains, not on desert surfaces; Hard volcanic rock: bare rocky desert surfaces are called 'Hammada', not 'Reg'.

Correct Answer: A. Downs

• **Downs** = fertile temperate grasslands in the Murray-Darling river basin of Australia, the most significant agricultural region in the country. • **Murray-Darling Basin** — the Murray-Darling Basin produces the majority of Australia's wheat and wool; the 'Downs' in this basin include the Darling Downs and Liverpool Plains. • 💡 Wrong-option analysis: Pampas: temperate grasslands of Argentina in South America; Steppes: temperate grasslands of Eurasia; Veld: temperate grasslands of southern Africa.

Correct Answer: A. Patagonian Desert

• **Patagonian Desert** = largest desert in South America by area (~673,000 sq km), a cold winter desert in southern Argentina caused by the Andes rain shadow. • **Atacama vs. Patagonian** — while the Atacama is famous for being the world's driest desert, it covers only about 105,000 sq km; the Patagonian Desert is about 6 times larger by area. • 💡 Wrong-option analysis: Monte Desert: a smaller shrubby desert in Argentina, not the largest; Sechura Desert: a small coastal desert in Peru; Atacama Desert: the driest but not the largest desert in South America.

Correct Answer: B. Australian Deserts

• **Australian Deserts (Red Centre)** = the interior of Australia is called the 'Red Centre' because iron oxides (rust) in the sand give it a distinctive rusty-red color. • **Uluru (Ayers Rock)** — Uluru is the most famous landmark of the Red Centre; it is a massive sandstone monolith and a sacred site for the Anangu Aboriginal people of Australia. • 💡 Wrong-option analysis: Gobi Desert: is grey-black in color due to rock and gravel, not red; Gibson Desert: part of the Red Centre region, but the broader Australian interior is called the 'Red Centre'; Thar Desert: has yellowish-brown sand, not the characteristic deep red of Australia.

Correct Answer: A. Steppes

• **Steppes** = vast temperate grasslands in Central Asia and Eastern Europe, characterized by extreme continental temperature ranges and historically home to nomadic pastoralists. • **Eurasian Steppe Belt** — the Steppes stretch from Hungary to Manchuria, a distance of about 8,000 km; historically they were the homeland of Mongols, Scythians, and other nomadic empires. • 💡 Wrong-option analysis: Savannas: tropical grasslands of Africa and South America with distinct wet-dry seasons; Prairies: temperate grasslands of central North America; Llanos: tropical grasslands of Colombia and Venezuela.