Carbon is also found in the atmosphere where it's a part of carbon dioxide gas emitted when fossil fuels are burned and when living organisms breathe. It's in organic matter in the soil, and it's in rocks. But far and away the most carbon on Earth is stored in a surprising place: the ocean.
So, where is all this carbon hiding out? Look in the mirror. Carbon is the building block for all life on Earth (which is why Captain Kirk and NASA are always looking for carbon-based life forms on other planets), and a good chunk of the total amount of it that the Earth has is in living and dead organic molecules. That means it's not only in you and your dog, but also in things like fossil fuels and road kill. Carbon is also found in the atmosphere where it's a part of carbon dioxide gas emitted when fossil fuels are burned and when living organisms breathe. It's in organic matter in the soil, and it's in rocks. But far and away the most carbon on Earth is stored in a surprising place: the ocean. There's estimated to be 38,000 to 40,000 billion metric tons of carbon in the ocean itself with a whopping 66 million to 100 million-billion metric tons of carbon in marine sediments and sedimentary rocks. Those sediments and rocks develop from the hard shells and body parts of marine organisms that have absorbed the carbon in the water. When they die, their bodies sink to the ocean floor, and the hard parts break down into sediment, which later are formed into sedimentary rocks.
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