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Published byBennett Norman Modified over 6 years ago
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Earth as a System Scientists divided this system into four parts:
The Geosphere (rock) The Atmosphere (air) The Hydrosphere (water) The Biosphere (living things)
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Earth as a System
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Earth as a System Geosphere:
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The Earth Is a Dynamic Planet
What is geology? Three major concentric zones of the earth Core Mantle Crust Continental crust Oceanic crust: 71% of crust
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Compositional Layers of Earth
Earth is divided into three compositional layers Crust Mantle Core Crust Mantle Core
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Crust Earth’s outermost layer
Composed almost entirely of light elements Thinnest layer
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Mantle The layer beneath the crust Made of rocks of medium density
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Core Earth’s innermost layer Composed of dense elements
3,428 km radius
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Physical Layers of Earth
Earth is divided into five physical layers Lithosphere Asthenosphere Mesosphere Outer Core Inner Core
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Physical Layers of Earth
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Lithosphere Earth’s outer layer Cool, rigid
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Asthenosphere Layer beneath the lithosphere Flows slowly
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Mesosphere “Middle layer” of Earth The lower part of the mantle
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Outer Core Outer shell of Earth’s core Liquid
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Inner Core Innermost layer of Earth Solid Very hot
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Discovering Earth’s Interior
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Major Features of the Earth’s Crust and Upper Mantle
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The Earth Beneath Your Feet Is Moving
Tectonic plates – pieces the lithosphere is divided into Plates move on the asthenosphere
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The Earth’s Major Tectonic Plates
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The Earth Beneath Your Feet Is Moving (2)
Three types of boundaries between plates Divergent plates Magma Oceanic ridge
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The Earth Beneath Your Feet Is Moving (2)
Three types of boundaries between plates Convergent plates Subduction Subduction zone Trench
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Continental/Continental: https://www. geolsoc. org
Continental/ Oceanic: Oceanic/Oceanic:
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The Earth Beneath Your Feet Is Moving (2)
Three types of boundaries between plates Transform fault; e.g., San Andreas fault
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The Earth’s Crust Is Made Up of a Mosaic of Huge Rigid Plates: Tectonic Plates
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Mantle Convection
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The San Andreas Fault as It Crosses Part of the Carrizo Plain in California, U.S.
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Paleomagnestism
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Paleomagnestism
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