1.   But volatile gas accumulates wherever grain is stored in large quantities, and corn itself provides a potent source of fuel once a blaze has started.

2.   Global warming occurs when such gases accumulate in the atmosphere, trapping heat.

3.   Global warming occurs when heat trapping gasses, chiefly carbon dioxide, accumulate in the atmosphere.

4.   The concern of modern times is that more and more man-made gases are accumulating in that blanket.

5.   The gas would accumulate, overcoming swimmers in the water and passengers on afterdecks.

6.   The safety agency says under certain conditions, exhaust gases can accumulate in the rear wheelhouse.