Define biogeochemical cycle. List two differences between two types of biogeochemical cycles.

Explanation

### Step-by-Step Solution

**Step 1: Define Biogeochemical Cycle**
A biogeochemical cycle, also known as nutrient cycling, refers to the movement of nutrients through various components of an ecosystem. These components include both biotic (living organisms) and abiotic (non-living elements such as soil, water, and air) factors. The cycle involves the transfer and transformation of essential nutrients like carbon, nitrogen, phosphorus, and sulfur among these components.

**Step 2: Identify the Types of Biogeochemical Cycles**
There are two main types of biogeochemical cycles:
1. **Gaseous Cycles**: In these cycles, the nutrients primarily exist in gaseous forms and are exchanged between the atmosphere and living organisms. Examples include the carbon cycle and nitrogen cycle.
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