Earth is an open system regarding matter.

Answer

**Step-by-Step Solution:**

1. **Understanding the Concept of Systems**:
- A system can be classified as either open or closed based on how it interacts with its environment. An open system allows the exchange of both matter and energy with its surroundings, while a closed system allows only the exchange of energy, with no exchange of matter.

2. **Defining Earth as a System**:
- When we refer to Earth as a system, we need to consider its interactions with the surrounding environment, which includes outer space.

3. **Analyzing the Statement**:
- The statement claims that "Earth is an open system regarding matter." To evaluate this, we need to determine whether Earth exchanges matter freely with its environment.

4. **Examining Matter Exchange**:
- While energy can freely enter and leave the Earth (e.g., sunlight), the exchange of matter is limited. For example, while meteorites may enter the Earth’s atmosphere, the overall exchange of matter is not significant compared to the vastness of the Earth itself.

5. **Conclusion**:
- Since the exchange of matter is limited, Earth is classified as a closed system regarding matter. Therefore, the statement "Earth is an open system regarding matter" is false.

**Final Answer**: The statement is false; Earth is a closed system regarding matter.

---