Final answer:
Altitude is one factor that affects the type of cloud that will form. Different types of clouds form at different altitudes in the atmosphere.
Step-by-step explanation:
One factor that affects the type of cloud that will form is altitude. Different types of clouds form at different altitudes in the atmosphere. For example, cumulus clouds form at a lower altitude, while cirrus clouds form at a higher altitude. Wind direction, color of clouds, and size of ice pellets are not factors that directly affect the type of cloud that will form.