Question

These cloud are massive ,billowing clouds that often extend to great altitudes ​

Answer 1

Answer:

cumulonimbus clouds are massive extend to great altitude

Answer 2

Answer:

The massive, billowing clouds that often extend to great altitude are Cumulus clouds

Explanation:

Cumulonimbus clouds, cirrocumulus clouds and cirrostratus clouds. From which Cumulus and Cumulonimbus clouds can extend to a great altitudes in atmosphere.