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.
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.
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.
Trees are considered an open system. They need outside sources to survive like water, sunlight and soil. It needs energy to live.
a lake is an opensystem; most ecosystems are an example of an open system.
it's open system, tree exchanges substance with its environment.
Closed System
Biomes are open systems.
Odviously-it's-a-closed-system-what-really-come-in-and-out-of-the-earths-crusts...
closed
Closed (I think. All vertebrates I know of have a closed system)
They have open circulatory system.
air standard cycle is theoretical cycle and actual cycle is .................
Closed System
Closed cycle
Closed. It also has a water-vascular system. :)
typically open
The light bulb is a closed system: no mass transfer.
In an open system,both energy and matter flow.In an closed system only energy flow.In an isolated system neither energy nor matter flow.
In an open cycle gas turbine, the gases that are produced by combustion go directly into the atmosphere, though the heat produced can sometimes be reclaimed. In a closed cycle gas turbine, the gases produced are reused and are not emitted into the atmosphere.
Open. The phosphorous enters the system in mineral form (apatite is a type of rock that weathers into available mineral phosphorous) or from animal sources (guano, bone). Water will wash away phosphates which will cause a need for more. The availability of phosphate is a huge limiter in plant growth.
Closed System
closed.
closed system
Open loop (single cycle) involves a break requiring a restart, easily adapted to closed loop.