Earth is a closed system, therefore, it's true.
A closed system simply means a system where only energy is transferred in the surroundings. On the other hand, an open system is one where matter and energy can be transferred.
It should be noted that Earth is a closed system due to the fact that only energy can be naturally transfered in the atmosphere. In this case, it's neither gaining matter nor losing it.
Therefore, the statement is true.
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