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DEFINITIONS:

The biosphere is a closed self-regulating system that integrates living organisms with nonliving components of a planet (Lenkeit). The biosphere is part of the outer shell of a planet and includes the atmosphere, hydrosphere, and lithosphere (answers.com).

The hydrosphere is an open system that contains all of a planet's solid, liquid, and gaseous water (Answers.com). As an open system, the hydrosphere interacts with the surrounding systems through inputs and outputs (Lenkeit).

The atmosphere is an open system that consists of a gaseous mixture enveloping a planet (Answers.com). These gasses, known as air, include O2, N2 and H2O. The atmosphere is also composed of water, ice and dust particles. Atmosphere functions like a blanket, keeping Earth's heat from escaping into space (Lenkeit). It has also been compared to a greenhouse: like glass it lets short wave insulation inside, but keeps most of long wave ground radiation from going out (Lenkeit).

The......

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