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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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