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7 Cards in this Set
- Front
- Back
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'Ropey lava'
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Free flowing basaltic lava. when surface cools it forms a skin which wrinkles as lava continues to flow beneath
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'Blocky Lava'
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Free flowing basaltic lava forms a skin. volcanic gas breaks through the skin separating it.
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'Flow-banded lava'
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Viscous rhyolite. as partly solidified lava moves, crystals line up in direction of flow.
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Pillow lava
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When lava flows into water a thick skin is quickly formed.
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Vesicular lava
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When volcanic gases are trapped during cooling, leaving small round cavaties in the rock
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Amygdaloidal lava
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after vesicular lava has cooled, water may seep into the cavaties in the rock. water may evaporate leaving precipitate of minerals behind.
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Columnar jointing
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Cooling and contraction of thick flows. the contraction cause cracks to develop.
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