The 1929 crash triggered the Great Depression, causing widespread unemployment, poverty, and global economic collapse.

The Sahara Desert in Africa is the largest hot desert, covering 9.2 million sq km, though Antarctica is the largest overall desert.

Ferdinand Magellan led the first expedition to circumnavigate the globe (1519–1522); although he died en route, the voyage completed the circuit.

The Kyoto Protocol of 1997 aimed at reducing greenhouse gas emissions, establishing binding commitments for industrialized nations.

Akbar introduced the Zabti system, measuring land and fixing tax rates based on productivity, improving revenue collection efficiency.

The Great Barrier Reef, the world’s largest coral reef system, lies off Australia’s coast, stretching over 2,300 kilometers.

Sulfur dioxide emitted from fossil fuel combustion oxidizes to sulfuric acid in the atmosphere, contributing to acid rain.

Frank Gehry designed the Guggenheim Bilbao (opened 1997), noted for its curving titanium forms and revitalization of the city.

Abyssinia is the historical name for Ethiopia, a nation with a rich history of independence and ancient Christian heritage.

Michelangelo painted the Sistine Chapel ceiling (1508–1512), a masterpiece of Renaissance art depicting biblical scenes in fresco.