The Sonoran Desert, spanning 260,000 km² in the U.S. and Mexico, is famous for saguaro cacti, with 2025 census concerns about die-offs, as per a web source. Mojave, Chihuahuan, and Great Basin lack saguaros, making Sonoran Desert the correct choice.

The Mojave Desert, covering 124,000 km² in the U.S., includes Death Valley and had 16 new grasshopper species identified in 2025, as per a web source. Sonoran, Great Basin, and Chihuahuan are nearby but lack this discovery, making Mojave Desert the correct choice.

The Atacama Desert, spanning 105,000 km² in Chile and Peru, is the driest desert, with 2025 studies finding living microbes, as per a web source and an X post. Patagonian, La Guajira, and Monte are less extreme, making Atacama Desert the correct choice.

The Gobi Desert, covering 1.3 million km² in Mongolia and China, is the fifth largest desert and had a 2025 discovery of a dinosaur-era mammal fossil, as noted in a web source and an X post. Taklamakan, Thar, and Kyzylkum are smaller, making Gobi Desert the correct answer.

The Arabian Desert, spanning 2.33 million km², had 2025 studies revealing 8 million years of ‘Green Arabia’ with rivers and a 9,000-year-old lake in the Empty Quarter, as per web sources. Syrian and Negev are smaller, and Rub’ al-Khali is a sub-region, making Arabian Desert the correct choice.

The Sahara Desert, covering 9.2 million km² in North Africa, is the world’s largest hot desert, with 2025 studies revealing a 9,000-year-old lake and AI uncovering 5,000-year-old civilizations, as per web sources. Kalahari, Namib, and Libyan are smaller or sub-regions, making Sahara Desert the correct choice.

Staubbach Falls, in Switzerland’s Lauterbrunnen Valley, is a 297 m waterfall visited for its beauty in a 2025 X post. Reichenbach, Giessbach, and Trümmelbach are nearby but less emphasized, making Staubbach Falls the correct choice.

Devil’s Kettle Falls, in Minnesota’s Judge C.R. Magney State Park, is known for its mysterious split flow, highlighted for 2025 tourism, as per a web source. High, Gooseberry, and Minnehaha are less unique, making Devil’s Kettle Falls the correct choice.

Kalambo Falls, on the Zambia-Tanzania border, had evidence of early human activity linked to its water and forest resources studied in 2025, as per a web source. Victoria, Tugela, and Lumangwe lack this finding, making Kalambo Falls the correct choice.

Blood Falls, in Antarctica’s Taylor Glacier, is a red, iron-rich waterfall studied in 2025 for its subglacial source and microbes, as per web sources. McMurdo, Taylor, and Ross are not recognized waterfalls, making Blood Falls the correct choice.