African Rift Valley—Cracks into the Earth

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Erta Ale—Compact Fury of Lava Lakes
Zoom in on a remarkable feature of the African Rift Valley: the lava lake at Erta Ale in Ethiopia. This seething cauldron of molten rock is the oldest of the world's five active lava lakes, and it replicates on a small scale the complex process of plate tectonics.
Galapagos Rift—Wonders of Mid-Ocean Ridges
Continue your study of phenomena associated with plate tectonics by visiting the Galapagos Islands, made famous by Charles Darwin. This magnificent archipelago is on a volcanic hotspot near a mid-ocean ridge, formed by moving tectonic plates. Natural wonders abound in the region, both above and below water.
Fiordland National Park—Majestic Fjords
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Iceland—Where Fire Meets Ice
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Siwa Oasis—Paradise amidst Desolation
Located in the eastern Sahara Desert, Siwa is an island of water in a giant sea of sand. Investigate how an oasis with 1,000 springs can exist in one of the driest places on Earth. One clue is that the water beneath Siwa soaked into the ground more than 20…
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Going Home
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Iguazu Falls—Thundering Waterfalls
Waterfalls are among nature's most beautiful spectacles, and the most impressive falls form under unusual geological conditions. Along the border of Brazil and Argentina, tour thundering Iguazu Falls, a display of 275 separate falls over a 1.5-mile span with individual falls up to 270 feet high. Learn their close connection…