Chemical changes are considered unseen because they occur at the atomic level, changing the actual structure of the thing.
Stratus clouds reside below the 6,000ft range.
Altocumulus clouds reside in the 6,500-20,000ft range.
Cirrus clouds reside above the 20,000ft range.
Ordered from highest to lowest, the sequence of clouds will be:
Cirrus
Altocumulus
Stratus
I believe that the answer is ionic
A.a low basket with plastic liner