Oxides of nitrogen from car exhausts can spread through the atmosphere.
This occurs because gas molecules move from a region of ……1…… concentration to a region of ……2…… concentration by a process called ……3…… .
Which words correctly complete the gaps?

1: high / 2: low / 3: diffusion
2 )
1: high / 2: low / 3: evaporation
3 )
1: low / 2: high / 3: diffusion
4 )
1: low / 2: high / 3: evaporation
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