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An ice cave in a glacier. Athabaska Glacier, Canada. (Image : Ken Grimes) |
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A large lava tube. This has formed as lava has cooled and solidified around the edges of a large lava flow. The liquid lava inside has continued to flow and
eventually emptied the tube. These lava tubes at Undara, Queensland, Australia are the largest on earth. (Image : Ken Grimes) |
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The Undara lava tubes from the air. The collapsed tubes form a microclimate in which remnant rainforest has survived the
change to a drier climate. (Image : Ken Grimes) |
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Caver Janeen Samuel explores a small lava tube on Mt Eccles, Victoria, Australia. (Image : Ken Grimes) |
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A sea cave - in this case the cave roof has collapsed to form an arch. Tasmania, Australia. (Image : Gary Lewis) |
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