Translated version
Closed system
A system that exchanges energy with the environment but not matter. Earth is an almost closed system: it receives energy from the Sun, but receives and loses almost no matter (except for rare meteorites). All matter circulates within the system.
Original version
Uždara sistema
Sistema, kuri su aplinka keičiasi energija, bet nesikeičia materija. Žemė yra beveik uždara sistema: ji gauna energiją iš Saulės, bet materijos (išskyrus retus meteoritus) beveik negauna ir nepraranda. Visa materija cirkuliuoja sistemos viduje.
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