@@ -146,7 +146,7 @@ There are three main reasons why the atmosphere appears to be out of equilibrium
 
 1. **The ocean has structure** - it circulates and is stratified. Only CO<sub>2</sub> in the surface of the ocean can exchange with the atmosphere ({numref}`fig:carbon:reservoirs`).
 2. **CO<sub>2</sub> reacts with water** to form non-gaseous dissolved species. The chemistry of carbon in seawater changes how much CO<sub>2</sub> is available to equilibrate with the atmosphere.
-3. **Biological processes** in the surface ocean absorb up carbon from the atmosphere and transport it to the deep ocean, where it cannot equilibrate with the atmosphere.
+3. **Biological processes** in the surface ocean turn dissolved carbon into solid matter and transport it to the deep ocean, where it cannot equilibrate with the atmosphere.
 
 ```{figure} figures/carbon-components.png
 ---