Mount Kilimanjaro, Tanzania
Gregory G. Dimijian, M.D.
Mauna Loa Eruption #1
Phil Degginger
White Island Volcano, New Zealand
G. R. Roberts
Black Smoker Submarine Vent
Science Source
Taal Volcano Erupting #2
Josephus Daniels
Mount Mayon Volcano #2
Josephus Daniels
Cunitz Crater Of Venus
Nasa
Ra Patera Region
USGS/NASA/Science Source
Venus, Lava Flow From Maat Mons
Science Source
Mars Extinct Volcano, Olympus Mons
Nasa
Point Perspective Viking Mosaic, Valles
U.S. Geological Survey
Sisters Peak, Ascension Island #1
Robert Kennett
Tongue Fish In Hydrothermal Area
Science Source
Hydrothermal Smoker Vent #1
Science Source
Vestmannaeyjar And Slope Of Eldfell
Greg Dimijian
Mount Pinatubo Caldera
Stephen & Donna O'Meara
Banks Peninsula And Christchurch, New
Science Source
Gunung Agung, Indonesia
Alain Evrard
Batur Caldera, Indonesia #1
Alain Evrard
Eistla Regio Of Venus
Nasa
Pancake Volcano Domes
Science Source
Zooarium Chimney
Science Source
Mount Pinatubo Caldera #1
Stephen & Donna O'Meara
Spouter Geyser
Willard Clay
Vulcanologists At Mauna Loa
Phil Degginger
Devils Ashpit, Ascension Island #1
Robert Kennett
Desert Marbles
Charlie Ott
Mt. St. Helens Caldera
E.r. Degginger
Lava Fields-booby Hill, Ascension Island
Robert Kennett
Limpets In Hydrothermal Vent Area
Science Source
Hydrothermal Vent Community #4
Science Source
Namafjall Geothermal Area, Iceland
Ralph C. Eagle, Jr.
Olympus Mons Mars
Science Source
Heimaey Island, Iceland
Greg Dimijian
Devils Ashpit, Ascension Island #2
Robert Kennett
Bazman Volcano in Iran
Nasa
Bacterial Mat At Hydrothermal Vent
Science Source
Hydrothermal Smoker Vent
Science Source
Active Hydrothermal Vent
Science Source
Vent Tubeworms
Science Source
Pancake Volcano Domes #2
Science Source
Selvagem Grande, Savage Islands
NASA/Science Source
Helicopter Flight Over Active Crater
Greg Dimijian
Puu Oo Vent At Kilauea Volcano
Greg Dimijian
Remains Of Home Buried By Lava
Greg Dimijian
Mt Taranaki in New Zealand
GR Roberts
Mt Ngauruhoe, Nz
G. R. Roberts
Morning Glory Pool, Yellowstone
Willard Clay
Mauna Loa Eruption
Phil Degginger
Spewing Lava, Mauna Loa
Phil Degginger
Lava Flowing To The Sea
Phil Degginger
Devils Ashpit, Ascension Island
Robert Kennett
Sisters Peak, Ascension Island
Robert Kennett
Raung Volcano, Indonesia
Jack Fields
Desert Marbles #1
Charlie Ott
Active Volcano Mt. Pavlof
Carleton Ray
Tumulus Lava Dome
William Mullins
Hydrothermal Tubeworms
Science Source
Savage Islands, Atlantic Ocean
NASA/Science Source
Pancake Volcano Domes #1
Science Source
Molten Lava Flowing
Greg Dimijian
Walking Through Steam Vent In Iceland
Greg Dimijian
Haleakala National Park, Hawaii
Van D. Bucher
Taal Volcano Erupting #1
Josephus Daniels
Mount Mayon Volcano
Josephus Daniels
Mount Mayon Volcano #1
Josephus Daniels
Batur Caldera, Indonesia
Alain Evrard