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Scientists ignored Lake Vida because they thought that a lake of ice ________.

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the gases rise to the top and mix with air.  people from the villages turn over the water.  scientists have put in a computer system.  they have more gases trapped at the bottom than other crater lakes  
Scientists are planning to install pipes in all crater lakes.  Scientists still do not know how to prevent gas explosions  Explosion disasters could be avoided in the future  Warning systems have been set up in the villages nearby.  
the gases rise to the top and mix with air  people from the villages turn over the water  scientists have put in a computer system  they have more gases trapped at the bottom than other crater lakes  
erected a pressure-releasing pipe in the lake  identified the gases at the bottom of the lake  built a beautiful fountain near the lakes  removed all dangerous gases from the lakes  
the gases rise to the top and mix with air.  people from the villages turn over the water.  scientists have put in a computer system.  they have more gases trapped at the bottom than other crater lakes.  
team of scientists has erected a pressure-releasing pipe in the lake.  identified the gases at the bottom of the lake.  built a beautiful fountain near the lakes.  removed all dangerous gases from the lakes.  

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