<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>
The sun's energy is made up of burning hydrogen and helium.
The understanding of gravity was essential in the developmentof Albert Einstein theory of relativity. Which describe relationships between matter and motion.
