20. what type of system is earth?

All of the systems on Earth are classified as open systems. However, the Earth system as a whole is considered a closed system because there is a limit to how much matter is exchanged. Our Earth system has four spheres: the atmosphere, the biosphere, the hydrosphere, and the geosphere.

Earth is an OPEN system!

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best of luck my friends

answer; the correct answer is (travel horizontally);