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.
4042
Which African desert, the world’s largest hot desert, had evidence of a 9,000-year-old lake discovered in 2025?
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.
4043
Which waterfall straddles the Canada-USA border, known for its massive flow rate?
Niagara Falls, on the Canada-USA border, is renowned for its massive flow rate of 2,400 m³/s, with 2025 studies predicting slower erosion due to drier Great Lakes conditions, as per a web source. Yosemite, Havasu, and Multnomah are smaller, making Niagara Falls the correct choice.
4044
Which UK river, studied for microplastics in 2025, flows through London?
The Thames River, flowing through London, was found to contain microplastics in 2025 studies, as per web sources. Severn, Trent, and Avon are other UK rivers but less emphasized in these studies, making Thames River the correct choice.
4045
Which subglacial Antarctic lake, studied in 2025, rivals Lake Ontario in size?
Lake Vostok, beneath Antarctica’s ice, is one of the largest subglacial lakes, rivaling Lake Ontario, with 2025 studies on its isolation, as per a web source. Ellsworth, Whillans, and Mercer are smaller, making Lake Vostok the correct choice.
4046
Which U.S. lake, straddling California and Nevada, faces clarity loss in 2025?
Lake Tahoe, in California and Nevada, is known for its clarity, but 2025 studies show climate-driven clarity loss, as per a web source. Crater, Mono, and Salton face different issues, making Lake Tahoe the correct choice.
4047
Which Great Lake, studied for ancient hunting camps in 2025, borders Michigan and Ontario?
Lake Huron, in the USA and Canada, covers 59,600 km² and had ancient hunting camps discovered beneath it, with 2025 DNA studies, as per a web source. Superior, Erie, and Ontario lack this finding, making Lake Huron the correct choice.
4048
What is the largest of the Great Lakes, studied in 2025 for ancient basin formation?
Lake Superior, in the USA and Canada, is the largest Great Lake by area (82,100 km²), with 2025 studies suggesting its basin formed millions of years ago, as per a web source. Huron, Michigan, and Erie are smaller, making Lake Superior the correct choice.
4049
The sinking of the ferry MV Le Joola in 2002, which resulted in more deaths than the Titanic, occurred off the coast of:
