(01.05 MC) What is a key difference between the phosphorus cycle and the carbon and nitrogen cycles? Phosphorus is present in both living and non-living things. Significant amounts of phosphorus are not found in the atmosphere. Weathering and erosion release phosphorus. Plants absorb phosphorus from the soll.

## Step 1<br />The question is asking for a key difference between the phosphorus cycle and the carbon and nitrogen cycles. To answer this question, we need to understand what each of these cycles entails.<br /><br />## Step 2<br />The carbon and nitrogen cycles are biogeochemical cycles that involve the movement of these elements through the atmosphere. This means that these elements can be found in the atmosphere in significant amounts.<br /><br />## Step 3<br />On the other hand, the phosphorus cycle does not involve a gaseous phase. This means that phosphorus does not exist in the atmosphere in significant amounts.<br /><br />## Step 4<br />The phosphorus cycle involves the weathering and erosion of rocks, which release phosphorus into the soil and water. This is a key difference between the phosphorus cycle and the carbon and nitrogen cycles.