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

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

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

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

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

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

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

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

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

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