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Closed. Except for the rare case of humans launching objects into space and meteorites striking the planet (which represent an incredibly miniscule fraction of the total carbon), the amount of carbon in the system remains at a constant mass.

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16y ago
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14y ago

both. For everything except energy, it's closed.

For energy (i.e. the sun's input, radiation into space at night) it's open.

One definition of a closed system is a system that can exchange energy with it's environment but not matter. Therefore the earth is a closed system by this logic.

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9y ago

A tree is an open system. A tree needs energy and uses energy to survive and thrive. If the energy was closed off, the tree would not survive.

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9y ago

Trees are considered an open system. They need outside sources to survive like water, sunlight and soil. It needs energy to live.

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14y ago

a lake is an opensystem; most ecosystems are an example of an open system.

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13y ago

it's open system, tree exchanges substance with its environment.

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11y ago

Closed System

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12y ago

Biomes are open systems.

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Q: Is the water cycle an open or closed system?
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