CO2 levels are fluctuating annually, steadily increasing, at historically high levels, and conform to northern hemisphere patterns.
CO2 levels are characterized by annual fluctuations, a steady long-term increase, reaching historically high levels, and conformity to northern hemisphere patterns.
| Front | Oil/natural gas formation |
|---|---|
| Back | anoxic conditions created by sediments on ocean floor, burial and compaction heat the matter to form hydrocarbons, then oil and gas, forced to accumulate in porous rocks |
Tags: 4_3_carbon_cycling
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