D:\Students Documents\Earth Science 1 2
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Transcript of D:\Students Documents\Earth Science 1 2
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A view of Earth 1.2
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Hydrosphere
• The water portion of Earth; one of the traditional subdivisions of Earth’s physical environment.
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Atmosphere
• The gaseous portion of the planet; the planet’s envelop of air; one of the traditional subdivisions of Earth’s physical environment.
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Geosphere
• Layer of Earth under both the atmosphere and the oceans; it is composed of the core, the mantle, and the crust.
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Biosphere
• All life on Earth; the parts of the solid Earth, hydrosphere, and atmosphere in which living organisms can be found.
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Core
• The innermost layer of Earth, located beneath the mantle; the core is divided into an outer core and an inner core.
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Mantle
• The 2890-Kilometer-thick layer of Earth located below the crust.
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Crust
• Thin, rocky outer layer of Earth.
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Key Concept
• What are the four major spheres into which Earth is divided? – Earth can be thought of
as consisting of four major sphere: the hydrosphere, atmosphere, geosphere, and biosphere.
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Key Concept• What defines the
three main parts of the solid Earth?– Because the
geosphere is not uniform, it is divided into three main parts based on differences in composition- the core, the mantle, and the crust.
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Key Concept• Which model explains the
position of continents and the occurrence of volcanoes and earthquakes?– The theory that finally
emerged, called plates tectonics, provided geologists with a model to explain how earthquakes and volcanic eruptions occur and how continents move.