Erosion is the:

**The reasoning** Erosion comes from the Latin word *erodere* meaning "to gnaw away." It's a **natural process where soil and rock are worn away and transported** from one location to another by agents like wind, water, ice, or gravity. Think of how rainfall washes away topsoil on farmland, or how wind blows sand across the Sahel region. The key word is **"wearing away"** — material is being removed, not added or changed into something else. **Why the wrong options tempt you** - **A (Loss of plants)** — This is actually *deforestation*. While losing plants can *cause* erosion (no roots to hold soil), it's not erosion itself. - **C (Excess of water)** — Water is an *agent* of erosion, not erosion itself. This confuses the cause with the effect. - **D (Build-up of nutrients)** — This is the opposite! Build-up is called *deposition*. Erosion removes material; deposition adds it. **Quick takeaway** Erosion = wearing away and removal of soil/rock; think "e-RODE" like a road being worn down by traffic.