20 26 20 16 12 19 11 25 16 chapter, derived from data provided to the National Geophysical Data Center from satellites and shipborne sensors. These features-and a basic understanding of the geological reasons for their existence-will help you recall the dramatic nature and history of the seafloor that we have discussed in the past two chapters. Figure 4.34 The Grand Tour. A technological tour de force: a map that shows all the features discussed in this 29 10 14 24 27 28 18 22 23 Key to features: (1) Aleutian Trench (2) Hawai'ian islands (3) Juan de Fuca Ridge (4) Clipperton Fracture Zone (5) Peru-Chile Trench (6) East Pacific Rise (7) Mariana Trench, Challenger Deep (8) Mid-Atlantic Ridge (9) South Sandwich Trench (1o) Red Sea (11) Easter Island (12) Galápagos Rift (13) Iceland (14) Gulf of Aden (15) Pacific-Antarctic Ridge (16) Azores (17) Tristan de Cunha (18) Kermadec Trench (19) Tonga Trench (20) Hatteras Abyssal Plain (21) Grand Bank (22) Mid-Indian Ridge (23) Atlantic-Indian Ridge (24) Maldive Islands (25) Eltanin Fracture Zone (26) Emperor Seamounts (27) Java Trench (28) Great Barrier Reef (29) Kuril Trench (30) Japan Trench

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