Sand boil

Sand boils and a silt-covered street after the 2011 Canterbury earthquake.

Sand boils or sand volcanoes occur when water under pressure wells up through a bed of sand. The water looks like it is "boiling" up from the bed of sand, hence the name.

单词	Sand boil
释义	Sand boil 英语百科 Sand boil Sand boils or sand volcanoes occur when water under pressure wells up through a bed of sand. The water looks like it is "boiling" up from the bed of sand, hence the name.
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