Where is carbon stored in the largest amounts on earth

Carbon stored in the largest amounts on the earth in the form rocks.

Explanation:

Total carbon present on earth surface and atmosphere is 65500 billion tons. Out of this, half amount of carbon is stored in the rocks about 36000 billion tons. This carbon moves from one region to another region through carbon cycle. Very low amount of carbon present in the atmosphere about 0.03 % in the form of carbondioxide and carbonmonoxide.