Land and sea breezes are convection currents of cold and warm air.

Answer

**Step-by-Step Solution:**

1. **Understanding Convection Currents:**
- Convection currents are movements of air caused by the heating and cooling of air. Warm air rises, while cold air sinks. This process creates a cycle of air movement.

2. **Specific Heat Capacity:**
- The specific heat capacity is the amount of heat energy required to raise the temperature of a substance. Water has a higher specific heat capacity than sand, meaning it takes longer to heat up and cool down compared to sand.

3. **Heating of Land and Water:**
- During the day, the sun heats the land faster than it heats the water. As a result, the air above the land becomes warmer than the air above the water.

4. **Formation of Sea Breeze:**
- The warm air above the land rises because it is less dense. As it rises, it creates a low-pressure area. The cooler, denser air above the water then moves in to fill this low-pressure area, creating a breeze from the sea to the land. This is called a sea breeze.

5. **Formation of Land Breeze:**
- At night, the land cools down faster than the water. The air above the land becomes cooler and denser, while the air above the water remains warmer. The cooler air from the land then moves towards the water, creating a breeze from the land to the sea. This is called a land breeze.

6. **Conclusion:**
- Thus, land and sea breezes are examples of convection currents where warm air rises and cold air moves in to replace it, resulting in a continuous cycle of air movement.

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