Question

question 9
the fall of the barometer (decreasing pressure)...(select all that apply)
a occurs when wind and rain happen together.
b denotes thaw in frosty weather.
c presages frost in winter.
d denotes high wind.

Explanation:

A falling barometer (decreasing pressure) often indicates unsettled weather conditions. Wind - rain combinations are associated with low - pressure systems. High winds can also be a feature of low - pressure systems. Thaw in frosty weather and frost in winter are more related to temperature changes rather than just pressure changes.

Answer:

A. occurs when wind and rain happen together.
D. denotes high wind.