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Practice Reading: Reading Fill in the Blanks
ID: #31629
Volcanoes
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Volcanoes blast more than 100 million tons of carbon dioxide into the atmosphere every year, but the gas is usually . When a volcano erupts, carbon dioxide spreads out into the atmosphere and isn't in one spot. But sometimes the gas gets trapped under enormous pressure. If it escapes to the surface in a dense , it can push out oxygen-rich air and become deadly.
cloud
grained
harmless
underground
concentrated
pointed
organ
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