Final answer:
Clouds with the prefix 'alto' are mid-level clouds that form between 2,000 and 7,000 meters high and can be indicators of changing weather conditions.
Step-by-step explanation:
Clouds denoted by the prefix "alto" are typically mid-level clouds that form between 2,000 and 7,000 meters (6,500 to 23,000 feet) above Earth's surface. These clouds usually consist of water droplets and are often indicative of fair weather, though they can precede a warm front, potentially leading to more stormy conditions. Examples of such clouds include altostratus and altocumulus.
The former is more of a uniform and flat gray or blue-gray cloud that can cover the entire sky and often precedes precipitation. The latter, altocumulus clouds, appear as white or gray patches that are sometimes grouped in rows. Despite not being particularly associated with heavy rainfall, these clouds can signal a change in the weather is on the horizon.