The Indian Ocean: A Perspective - Quiz

When was the Indian Ocean systematically studied for oceanography?

• Early 1960s

• Late 1970s

• Mid-1980s

• Early 1990s

What is the average half-spreading rate of the Southwest Indian Ridge?

• 18 mm/yr

• 24 mm/yr

• 7-8 mm/yr

• 30 mm/yr

Which ridge is considered to be composed of a large number of short E-W segments displaced en echelon by a series of roughly NNE-SSW oriented transform faults?

• Southeast Indian Ridge

• Sheba Ridge

• Carlsberg Ridge

• Central Indian Ridge

Where is the Agulhas Plateau located?

• 200 km northwest of Madagascar

• 500 km southeast of the Cape of Good Hope

• 300 km east of Sri Lanka

• 1000 km south of the Arabian Peninsula

What is the estimated age of the Carlsberg Ridge based on magnetic anomaly data?

• Late Miocene

• Early Pliocene

• Early Miocene

• Late Oligocene

What is the average water depth of the Laxmi Ridge?

• 4.2 km

• 1.5 km

• 3.5 km

• 2.8 km

Which segment of the Laccadive-Chagos Ridge is considered to be a microcontinent which rifted away from India?

• Deep water channel area

• Chagos Bank

• Maldive Ridge

• Laccadive Plateau

What is the inferred age of the oldest sediment cored over the Madagascar Ridge?

• Late Cretaceous-Early Paleocene

• Middle Eocene

• Late Eocene

• Early Eocene

What is the depth of the Moho in the Laccadive Plateau?

• 19-20 km

• 15-16 km

• 21-22 km

• 17-18 km

According to the hot spot model of genesis, what does the deep water channel area between the Maldive Ridge and the Chagos Bank represent?

• All of the above

• A period of rapid northward plate motion

• A temporary lull in hotspot activity

• A brief failed attempt at rifting