During photosynthesis, plants absorb carbon dioxide and sunlight to create fuel-glucose and other sugars for building plant structures. This process forms the foundation of the fast (biological) carbon cycle.
The Slow Carbon Cycle. ... Atmospheric carbon combines with water to form a weak acid—carbonic acid—that falls to the surface in rain. The acid dissolves rocks-a process called chemical weathering-and releases calcium, magnesium, potassium, or sodium ions.
