Concept:High clouds form at high altitudes and are mainly composed of ice crystals. The main high cloud type listed is cirrus.
Explanation:Clouds are classified by the height of their base above the earth's surface.
High clouds form between
6,000 m and
12,000 m above the ground.
They are made up of ice crystals because temperatures at that altitude are very low.
The three main types of high clouds are cirrus, cirrocumulus, and cirrostratus.
Cirrus clouds appear white, thin, and wispy, and they are composed of ice crystals.
Option A, stratus, is a low cloud that forms layered sheets near the ground.
Option C, altostratus, is a middle cloud that partially covers the sky with water droplets.
Option D, altocumulus, is also a middle cloud, made up of water droplets arranged in layers or lines.
Therefore, only cirrus belongs to the high cloud group among the given options.
Answer:B. cirrus