The lower mantle is composed of magnesium, iron-bearing silicates, olvine, and pyroxene.
<span>Cumulus and stratus clouds belong to the low cloud group which exists up to 6,500 feet. Other clouds belonging to this type are s</span>tratus, stratocumulus and
<span>Nimbostratus clouds.Middle clouds include altostratus and altocumulus clouds on the other hand found from 6500 feet to 8000 feet. </span>