Question

_____ usually means rainy weather because moist air is rising.

a. rising temperature
b. rising air pressure
c. decreasing temperature
d. decreasing air pressure

Explanation:

In meteorology (subfield of Natural Science - Geography/Physics - related to weather), decreasing air pressure allows moist air to rise. As air rises, it cools, condenses, and forms clouds leading to rain. Rising temperature (A) doesn't directly cause moist air to rise for rain; rising air pressure (B) suppresses air rising (stable, clear weather); decreasing temperature (C) alone doesn't relate to moist air rising for rain as pressure - temperature - air movement dynamics show that low pressure (decreasing air pressure) is linked to rising moist air and precipitation.

Answer:

D. Decreasing air pressure