Question

which is most likely to cause clouds to form in a previously clear sky? (1 point)
○ an air mass sinks and becomes warmer.
○ an air mass sinks and becomes colder.
○ a colder air mass moves into the area and rises.
○ a warmer air mass moves into the area and rises.

Explanation:

Clouds form when air rises, cools, and water vapor condenses. A warmer air - mass is less dense and rises. As it rises, it cools and water vapor in it condenses to form clouds. When air sinks, it warms and clouds are less likely to form. A colder air - mass is denser and usually sinks rather than rises on its own in this context.

Answer:

A warmer air mass moves into the area and rises.