Rocks and Lava

雪儿 · 发表于: 2011-7-13 12:26:08

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Spreading Pahoehoe Lava

Photograph by Marc Moritsch

Pahoehoe lava, the hottest Hawaiian lava type, may darken into ropy strands or wrinkle into silver-sheened taffy, such as this flow in Hawai'i Volcanoes National Park.

雪儿 · 发表于: 2011-7-13 12:27:21

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Patterned Rock

Photograph by Charles Kogod

Erosion reveals swirls of color and pattern in rocks in Point Lobos State Reserve, California.

雪儿 · 发表于: 2011-7-13 12:27:35

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Cooled Lava

Photograph by Marc Moritsch

Cooled pahoehoe Hawaiian lava solidifies into igneous rock with a ropelike pattern. Another type of Hawaiian lava, called aa, is a creeping slag that hardens into brutally jagged pieces.

雪儿 · 发表于: 2011-7-13 12:28:11

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Rocks, California

Photograph by Charles Kogod

Eroded rocks pop with colorful designs in Point Lobos State Reserve, California.

雪儿 · 发表于: 2011-7-13 12:28:41

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Petra Sandstone

Photograph by Annie Griffiths Belt

Crimson striations run through a sandstone rock face in Petra in Jordan

雪儿 · 发表于: 2011-7-13 12:29:03

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Swirls of Lava, Hawaii

Photograph by Frans Lanting

Flowing lava in Hawai'i Volcanoes National Park creates vivid swirls in this close-up shot. The relatively gentle, flowing nature of lava in Hawai’i creates mounded mountains said to resemble ancient battle shields, giving them the name shield volcanoes.

雪儿 · 发表于: 2011-7-13 12:29:23

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Boiling Lava, Etna

Photograph by Carsten Peter

Lava bubbles and boils during a spectacular 2002 eruption of Italy's Mount Etna. For 24 days, the volcano gave its most dazzling show in a decade, spewing rivers of lava and fountains of fire.

雪儿 · 发表于: 2011-7-13 12:29:43

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Mauna Ulu Vent

Photograph by Robert Madden

A fountain of lava erupts from the Mauna Ulu vent in Hawaii’s Kilauea volcano. Of the state's four active above-water volcanoes, only Kilauea and Mauna Loa have spit lava in the past 200 years.

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