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  • Crater Lake - Crater Lake National Park - Oregon - United States<br />
<br />
About 6,800 years ago, at the climax of a series of dramatic eruptions, the top of Mt. Mazama collapsed.  Left behind was the huge crater, or caldera, you see today.  But before the caldera filed with water, there were more eruptions.<br />
<br />
The most striking evidence of post-collapse volcanic activity is Wizard Island, the small volcano in the middle of Crater Lake.  It's symmetrical cone was formed by a fountain of cinders which erupted from the caldera floor.  On the left side of the caldera, a similar cone appeared, but today it lies hidden 496 feet (151m) beow the lake surface. <br />
<br />
Geologists believe that lava flows which erupted after the collapse helped to seal the fractured caldera floor, allowing melting snow and rain to accumulate. <br />
<br />
When Mt. Mazama collapsed about 6,800 years ago, it left behind evidences of its former self.  Like X-ray photos, the steep caldera walls reveal the interior of Mt. Mazama before its fall.  <br />
<br />
The massive gray monolith on the rim is Llao Rock.  It formed when a large outpouring of lava filled an explosion crater on the north slope of Mt. Mazama.  When Mt. Mazama collapsed, part of the hardened lava flow broke off and fell into the caldera, leaving the downslope portion perched on the rim.<br />
<br />
The jagged, colorful spires of Hillman Peak are the remains of a secondary volcano which erupted on the side of Mt. Mazama.  This satellite cone attained a height of 1,000 feet (300m). Erosion has exposed a maze of clogged and solified lava conduits that fed the Hillman volcano.
    070310-209.jpg
  • Crater Lake - Crater Lake National Park - Oregon - United States<br />
<br />
About 6,800 years ago, at the climax of a series of dramatic eruptions, the top of Mt. Mazama collapsed.  Left behind was the huge crater, or caldera, you see today.  But before the caldera filed with water, there were more eruptions.<br />
<br />
The most striking evidence of post-collapse volcanic activity is Wizard Island, the small volcano in the middle of Crater Lake.  It's symmetrical cone was formed by a fountain of cinders which erupted from the caldera floor.  On the left side of the caldera, a similar cone appeared, but today it lies hidden 496 feet (151m) beow the lake surface. <br />
<br />
Geologists believe that lava flows which erupted after the collapse helped to seal the fractured caldera floor, allowing melting snow and rain to accumulate. <br />
<br />
When Mt. Mazama collapsed about 6,800 years ago, it left behind evidences of its former self.  Like X-ray photos, the steep caldera walls reveal the interior of Mt. Mazama before its fall.  <br />
<br />
The massive gray monolith on the rim is Llao Rock.  It formed when a large outpouring of lava filled an explosion crater on the north slope of Mt. Mazama.  When Mt. Mazama collapsed, part of the hardened lava flow broke off and fell into the caldera, leaving the downslope portion perched on the rim.<br />
<br />
The jagged, colorful spires of Hillman Peak are the remains of a secondary volcano which erupted on the side of Mt. Mazama.  This satellite cone attained a height of 1,000 feet (300m). Erosion has exposed a maze of clogged and solified lava conduits that fed the Hillman volcano.
    070310-089.jpg
  • Crater Lake - Crater Lake National Park - Oregon - United States<br />
<br />
About 6,800 years ago, at the climax of a series of dramatic eruptions, the top of Mt. Mazama collapsed.  Left behind was the huge crater, or caldera, you see today.  But before the caldera filed with water, there were more eruptions.<br />
<br />
The most striking evidence of post-collapse volcanic activity is Wizard Island, the small volcano in the middle of Crater Lake.  It's symmetrical cone was formed by a fountain of cinders which erupted from the caldera floor.  On the left side of the caldera, a similar cone appeared, but today it lies hidden 496 feet (151m) beow the lake surface. <br />
<br />
Geologists believe that lava flows which erupted after the collapse helped to seal the fractured caldera floor, allowing melting snow and rain to accumulate. <br />
<br />
When Mt. Mazama collapsed about 6,800 years ago, it left behind evidences of its former self.  Like X-ray photos, the steep caldera walls reveal the interior of Mt. Mazama before its fall.  <br />
<br />
The massive gray monolith on the rim is Llao Rock.  It formed when a large outpouring of lava filled an explosion crater on the north slope of Mt. Mazama.  When Mt. Mazama collapsed, part of the hardened lava flow broke off and fell into the caldera, leaving the downslope portion perched on the rim.<br />
<br />
The jagged, colorful spires of Hillman Peak are the remains of a secondary volcano which erupted on the side of Mt. Mazama.  This satellite cone attained a height of 1,000 feet (300m). Erosion has exposed a maze of clogged and solified lava conduits that fed the Hillman volcano.
    070310-251.jpg
  • Texas bluebonnets are the state flower of Texas. Every year, spring in Texas brings this beautiful display of color to the sides of roads everywhere.
    040900I-17.jpg
  • Ridell Beach near Broom - Kimberley Plateau, Western Australia <br />
<br />
The sun sets into the ocean in this beautiful scene on Ridell Beach near Broom in Western Australia.
    102601A-01.jpg
  • Slaty Egret (Egretta vinaceigula) - Mombo - Okavango Delta - Botswana
    010503E-19.jpg
  • This view from Weeping Rock in Zion National Park affords views of massive canyon walls ascending toward a brilliant blue sky. To experience Zion, you need to walk among the towering cliffs, or challenge your courage in a small narrow canyon. These unique sandstone cliffs range in color from cream, to pink, to red. They could be described as sand castles crowning desert canyons. Zion's unique geographic location and variety of life zones combine to create a variety of habitats for a surprising array of plant and animal species. Located on the Colorado Plateau, but bordering the Great Basin and Mojave Desert Provinces, Zion is home to plants from each region.
    062798B-02.jpg
  • Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, meaning valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 ft (300 m) above the valley floor. It is located on the Arizona-Utah state line near the Four Corners area. The valley lies within the range of the Navajo Nation Reservation.  The area is part of the Colorado Plateau. The elevation of the valley floor ranges from 5,000 to 6,000 feet (1,500 to 1,800 m) above sea level. The floor is largely siltstone of the Cutler Group, or sand derived from it, deposited by the meandering rivers that carved the valley. The valley's vivid red color comes from iron oxide exposed in the weathered siltstone. The darker, blue-gray rocks in the valley get their color from manganese oxide.  The buttes are clearly stratified, with three principal layers. The lowest layer is the Organ Rock Shale, the middle is de Chelly Sandstone, and the top layer is the Moenkopi Formation capped by Shinarump Conglomerate. The valley includes large stone structures including the famed "Eye of the Sun".
    091615-052.jpg
  • Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, meaning valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 ft (300 m) above the valley floor. It is located on the Arizona-Utah state line near the Four Corners area. The valley lies within the range of the Navajo Nation Reservation.  The area is part of the Colorado Plateau. The elevation of the valley floor ranges from 5,000 to 6,000 feet (1,500 to 1,800 m) above sea level. The floor is largely siltstone of the Cutler Group, or sand derived from it, deposited by the meandering rivers that carved the valley. The valley's vivid red color comes from iron oxide exposed in the weathered siltstone. The darker, blue-gray rocks in the valley get their color from manganese oxide.  The buttes are clearly stratified, with three principal layers. The lowest layer is the Organ Rock Shale, the middle is de Chelly Sandstone, and the top layer is the Moenkopi Formation capped by Shinarump Conglomerate. The valley includes large stone structures including the famed "Eye of the Sun".
    091615-062.jpg
  • Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, meaning valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 ft (300 m) above the valley floor. It is located on the Arizona-Utah state line near the Four Corners area. The valley lies within the range of the Navajo Nation Reservation.  The area is part of the Colorado Plateau. The elevation of the valley floor ranges from 5,000 to 6,000 feet (1,500 to 1,800 m) above sea level. The floor is largely siltstone of the Cutler Group, or sand derived from it, deposited by the meandering rivers that carved the valley. The valley's vivid red color comes from iron oxide exposed in the weathered siltstone. The darker, blue-gray rocks in the valley get their color from manganese oxide.  The buttes are clearly stratified, with three principal layers. The lowest layer is the Organ Rock Shale, the middle is de Chelly Sandstone, and the top layer is the Moenkopi Formation capped by Shinarump Conglomerate. The valley includes large stone structures including the famed "Eye of the Sun".
    091515-128.jpg
  • Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, meaning valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 ft (300 m) above the valley floor. It is located on the Arizona-Utah state line near the Four Corners area. The valley lies within the range of the Navajo Nation Reservation.  The area is part of the Colorado Plateau. The elevation of the valley floor ranges from 5,000 to 6,000 feet (1,500 to 1,800 m) above sea level. The floor is largely siltstone of the Cutler Group, or sand derived from it, deposited by the meandering rivers that carved the valley. The valley's vivid red color comes from iron oxide exposed in the weathered siltstone. The darker, blue-gray rocks in the valley get their color from manganese oxide.  The buttes are clearly stratified, with three principal layers. The lowest layer is the Organ Rock Shale, the middle is de Chelly Sandstone, and the top layer is the Moenkopi Formation capped by Shinarump Conglomerate. The valley includes large stone structures including the famed "Eye of the Sun".
    091615-044.jpg
  • Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, meaning valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 ft (300 m) above the valley floor. It is located on the Arizona-Utah state line near the Four Corners area. The valley lies within the range of the Navajo Nation Reservation.  The area is part of the Colorado Plateau. The elevation of the valley floor ranges from 5,000 to 6,000 feet (1,500 to 1,800 m) above sea level. The floor is largely siltstone of the Cutler Group, or sand derived from it, deposited by the meandering rivers that carved the valley. The valley's vivid red color comes from iron oxide exposed in the weathered siltstone. The darker, blue-gray rocks in the valley get their color from manganese oxide.  The buttes are clearly stratified, with three principal layers. The lowest layer is the Organ Rock Shale, the middle is de Chelly Sandstone, and the top layer is the Moenkopi Formation capped by Shinarump Conglomerate. The valley includes large stone structures including the famed "Eye of the Sun".
    091615-287.jpg
  • Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, meaning valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 ft (300 m) above the valley floor. It is located on the Arizona-Utah state line near the Four Corners area. The valley lies within the range of the Navajo Nation Reservation.  The area is part of the Colorado Plateau. The elevation of the valley floor ranges from 5,000 to 6,000 feet (1,500 to 1,800 m) above sea level. The floor is largely siltstone of the Cutler Group, or sand derived from it, deposited by the meandering rivers that carved the valley. The valley's vivid red color comes from iron oxide exposed in the weathered siltstone. The darker, blue-gray rocks in the valley get their color from manganese oxide.  The buttes are clearly stratified, with three principal layers. The lowest layer is the Organ Rock Shale, the middle is de Chelly Sandstone, and the top layer is the Moenkopi Formation capped by Shinarump Conglomerate. The valley includes large stone structures including the famed "Eye of the Sun".
    091515-002.jpg