Question

how can the earth be considered a closed system when it comes to matter? the earth constantly exchanges matter with other celestial bodies. the total matter on earth remains constant, with no matter entering or leaving. matter on earth is constantly increasing due to human activities.

Explanation:

A closed system in terms of matter means no net gain or loss of matter. The Earth has a relatively constant amount of matter as the matter within it is recycled (e.g., through biogeochemical cycles) and there is negligible net gain or loss of matter from outer space (the amount of meteoritic material adding to Earth's mass is extremely small compared to Earth's total mass and can be considered negligible for the concept of a closed - system regarding matter).

Answer:

The total matter on Earth remains constant, with no matter entering or leaving.