The main cause of wind movement is uneven ___________ on the earth.

Explanation

**Step-by-Step Solution:**

1. **Understanding Wind Movement:**
- Wind movement is primarily caused by differences in air pressure, which are influenced by temperature variations on the Earth's surface.

2. **Uneven Heating of the Earth's Surface:**
- The Earth's surface does not heat evenly. Some areas receive more sunlight and heat up faster than others. For example, land heats up more quickly than water.

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