Question

which observation would indicate that rain is approaching? falling barometer, increased cloudiness, falling temperatures rising barometer, increased cloudiness, rising temperatures falling barometer, increased cloudiness, rising temperatures rising barometer, decreased cloudiness, falling temperatures

Explanation:

To determine which observation indicates rain approaching, we analyze atmospheric conditions:

1. Barometer: A falling barometer (decreasing air pressure) is associated with approaching low - pressure systems, which often bring rain.
2. Cloudiness: Increased cloudiness occurs as moist air rises and condenses, a common precursor to rain.
3. Temperature: Falling temperatures can happen as a cold front (associated with rain - producing systems) approaches or as the air cools with increased cloud cover and moisture.

Now let's analyze each option:

• Option 1 (falling barometer, increased cloudiness, falling temperatures): Matches the conditions of a rain - approaching system. A falling barometer shows decreasing pressure, increased cloudiness is from moisture condensation, and falling temperatures are typical with approaching storm systems.
• Option 2 (falling barometer, increased cloudiness, rising temperatures): Rising temperatures are not typical of an approaching rain system (usually, temperatures fall or are stable before rain in many cases, especially with cold fronts).
• Option 3 (rising barometer, increased cloudiness, rising temperatures): A rising barometer indicates increasing air pressure, which is associated with fair weather, not approaching rain.
• Option 4 (rising barometer, decreased cloudiness, falling temperatures): A rising barometer and decreased cloudiness are signs of fair weather, not rain approaching.

Answer:

A. falling barometer, increased cloudiness, falling temperatures (assuming the first option is labeled A, adjust the label according to the actual option numbering in the question)