A) In the Sahara Desert
B) On the Galala Plateau, Egypt
C) In the Sinai Peninsula
D) Near the Nile Delta

A) Cavern formed by river erosion
B) Volcanic cave system
C) Glacier-formed cave
D) Karst-based subterranean environment

A) Permian era
B) Eocene era
C) Jurassic era
D) Cretaceous era

A) 71 miles (115 km) south-southeast
B) 50 miles north-northeast
C) 30 miles east
D) 100 miles west

A) During an archaeological dig
B) After quarry blasting created an entrance
C) Through satellite imaging
D) By a group of explorers hiking in the area

A) 3,000 ft (914 m)
B) 1,500 ft (460 m)
C) 2,300 ft (700 m)
D) 4,000 ft (1,219 m)

A) 30 ft (9 m)
B) 100 ft (30 m)
C) 50 ft (20 m)
D) 70 ft (21 m)

A) Marble
B) Alabaster
C) Sandstone
D) Granite

A) Ice formations
B) Stalactites and stalagmites
C) Geysers and hot springs
D) Fossilized remains of dinosaurs

A) 2010
B) 1985
C) 1992
D) 2000