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Practice Reading: Fill in The Blanks (Drag & Drop) ID: #31629 July Prediction Volcanoes
Instructions
* Drag the correct answer into all target fields
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.

concentrated pointed cloud harmless organ underground grained

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