21.   The actual amount of water needed by the crop depends on the weather conditions.

22.   The crash had occurred at a time of clear visibility and good weather conditions.

23.   The drive to Wilpattu takes from three to five hours, depending on weather conditions.

24.   The expedition was abandoned because of adverse weather conditions.

25.   The four climbers were eventually forced to admit defeat when weather conditions made it impossible to continue.

26.   The hazardous weather conditions put concerns about budget developments and the economy on the back burner.

27.   The hunt for the missing boy had to be called off because of severe weather conditions.

28.   The polar regions are particularly at risk because the chemical reaction that destroys ozone is helped by their weather conditions.

29.   The rescue was difficult because of the appalling weather conditions.