31.   The seismic test is needed to determine potential pathways for hydrogen sulfide and other toxins to reach the surface.

32.   The turbulent gusts develop as downdrafts within the thunderstorms and accelerate rapidly toward earth, spreading out in a destructive barrage upon reaching the surface.

33.   The turbulent gusts develop as downdrafts within the thunderstorms accelerate rapidly toward earth, spreading out in a destructive barrage upon reaching the surface.

34.   Their work is of vital importance to all citizens of the globe because the ozone layer absorbs dangerous ultraviolet radiation before it can reach the surface of the Earth.

35.   Then take another two breaths, alternating, until you reach the surface.

36.   They reach the surface in narrow volcanic tubes, called pipes.

37.   Usually dead by the time they reach the surface of the sea, such giants typically wash ashore or are captured accidentally by fishermen trawling at increasingly great depths.

38.   Water can encourage paint deterioration, so repair all leaks that could reach painted surfaces.

39.   When it reaches the surface, it bursts through cracks or fissures and spreads over the countryside, drowning everything in a sea of basaltic lava.

40.   A boy, trapped, forever struggling to reach the surface.