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  • A power plant produces geothermal energy at Krafla, Iceland. The power plant turns heat from below the earth’s crust into 60 megawatts of electricity. The Krafla area is very volcanic. The Krafla volcano erupted nine times between 1975 and 1984 and very high temperatures are found 3 to 5 kilometers (2 to 3 miles) of the earth’s surface.
    Iceland_Krafla_GeothermalEnergy_3294.jpg
  • Glowing embers shoot up in the midst of the flames of a fire at night.
    Flames_Night_3195.jpg
  • Flames from a fire glow at night.
    Flames_Night_2645.jpg
  • A painted turtle (Chrysemys picta) suns itself on a log off Foster Island in Seattle's Washington Park Arboretum.
    PaintedTurtleLog.jpg
  • Steam rises from Inferno Crater, located in the Waimangu Volcanic Rift Valley on the North Island of New Zealand. The hot spring and other geothermal features resulted from the volcanic eruption of Mount Tarawera on June 10, 1886. The area was named for the Waimangu geyser, which was active from 1901 to 1904.
    NZ_Waimangu_InfernoCrater_8980.jpg
  • Colorful algal and bacterial mats grow along a steaming creek that runs through the Waimangu Volcanic Rift Valley on the North Island of New Zealand. The valley's geothermal features resulted from the volcanic eruption of Mount Tarawera on June 10, 1886. The area was named for the Waimangu geyser, which was active from 1901 to 1904.
    NZ_Waimangu_BacterialMats_9008.jpg
  • A long exposure captures the path of embers rising from a fire.
    Flame_Embers_Abstract_2614.jpg
  • Thousands of monarch butterflies (Danaus plexippus) rest in a tree in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Cluster_Dawn_PacificGrove_08...jpg
  • Monarch butterflies (Danaus plexippus) cluster together in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Clusters_PacificGrove_0744.jpg
  • An arctic fox (Vulpes lagopus) in transition from its winter to summer coat walks across on old lava field on Iceland's Snæfellsnes peninsula. Arctic foxes have limbs, snouts and ears that are shorter than average, a feature that minimizes heat loss and the risk of frostbite. The pads of their feet are also covered in fur. Arctic foxes are primarily nocturnal; this fox was photographed shortly after midnight.
    Iceland_ArcticFox_7346.jpg
  • An American alligator (Alligator mississippiensis) swims toward the observer along the Anhinga Trail in the Everglades National Park, Florida. This is the largest of the two species of alligators, and is native only to the wetlands of the Southeastern United States. The raised bumps on its back are used to store heat..
    alligator-swimming-everglades-3219.jpg
  • Monarch butterflies (Danaus plexippus) cluster together in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Clusters_PacificGrove_0860.jpg
  • Monarch butterflies (Danaus plexippus) cluster together in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Clusters_PacificGrove_0873.jpg
  • A variety of thermophiles, which are microorganisms that thrive in heat, are responsible for the colors in the Grand Prismatic Spring, located in the Midway Geyser Basin area of Yellowstone National Park, Wyoming. The yellow-green color comes from the thermophilic cyanobacteria Synechococcus, which is found in the hottest water of the spring (up to 161°F or 72°C). Phormidium, which is orange, is found in the spring's middle temperatures (113-140°F or 45-60°C). Calothrix, which is brown or black, is found in the coolest temperatures, although not lower than 86°F or 30°C. The terraces are the result of minerals that solidify in water that spills out of the spring.
    Yellowstone_Grand-Prismatic-Spring_B...jpg
  • Thousands of Vaux’s swifts (Chaetura vauxi) fly into the chimney at the Wagner Performing Arts Center in Monroe, Washington. As many as 26,000 Vaux’s swifts use the chimney as a roost each night during their spring and fall migrations. Vaux’s swifts do not have back talons, so they cannot stand or perch; when roosting for the night, they cling to rough surfaces, mainly old-growth trees and the inside of old chimneys. They spend their days in flight catching insects and at night roost communally to conserve heat. The migratory roost in Monroe is one of the largest in North America.
    Swifts_Vauxs_Chimney_Monroe_3421.jpg
  • A pseudocrater is rendered in silhouette against a volanic cone at sunset in Mývatn in northern Iceland. Mývatn is a lake that was formed approximately 2,300 years ago during a volanic period. The shorter hill is a pseudocrater, also known as a rootless vent. While it resembles a volcanic cinder cone, it formed through a different process. As basaltic lava flowed over soggy lake sediments, it flash heated the moisture into vapor, causing it to blast through the lava. Mývatn means lake with midge flies; the lake is infested with them during the summer months.
    Iceland_Myvatn_Pseudocrater-Silhouet...jpg
  • Blue-green water flows in channels carved into volcanic rock just outside the Blue Lagoon (Bláa lónið) in Iceland. The warm water is rich in silica, sulfur and other minerals, giving the water its color and milky texture. The water is heated by geothermal process and used to produce electricity before it is used in the Blue Lagoon, a popular outdoor spa.
    Iceland_BlueLagoon_5765.jpg
  • The milky blue water of Iceland's Blue Lagoon (Bláa lónið) somewhat mimicks the color of the summer sky. Portions of the Blue Lagoon are heated with natural, geothermal energy. The mineral-rich hot pools are a popular tourist destination.
    Iceland_BlueLagoon_Sky_9934.jpg
  • A pseudocrater is rendered in silhouette against a volanic cone at sunset in Mývatn in northern Iceland. Mývatn is a lake that was formed approximately 2,300 years ago during a volanic period. The shorter hill is a pseudocrater, also known as a rootless vent. While it resembles a volcanic cinder cone, it formed through a different process. As basaltic lava flowed over soggy lake sediments, it flash heated the moisture into vapor, causing it to blast through the lava. Mývatn means lake with midge flies; the lake is infested with them during the summer months.
    Iceland_Myvatn_Pseudocrater-Silhouet...jpg
  • A thick layer of minerals, especially silica, lines the edge of the Blue Lagoon (Bláa lónið), a geothermal spa in Iceland. The warm water is rich in silica, sulfur and other minerals, giving the water its color and milky texture. The water is heated by geothermal process and used to produce electricity before it is used in the Blue Lagoon, a popular outdoor spa.
    Iceland_BlueLagoon_1292.jpg
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