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The Earth’s Mantle

Page 11 (Inside Earth)

 

·        The layer above the outer core is the mantle.

·        A very thin layer called the Gutenberg Discontinuity separates the mantle and the core.

·        A very thin layer called the Mohorovicic Discontinuity separates the mantle and the crust.

·        The very upper mantle is rigid and is considered part of the lithosphere. It has a temperature from 870°C.

·        The rest of the upper mantle is the Asthenosphere it is thick, and is a semi-solid.  It has the ability to flow.  It has the property of plasticity (like ooblek).

·        Asthenes means “weak” in Greek

·        The lower mantle is more rigid it is a solid due to the increase in pressure. It is filled with magma. It has a temperature that reaches 2,200°C .

·        The mantle contains the elements silicon, oxygen, iron and magnesium.

·        Both pressure and density increase as you go deeper into the mantle.

 

Plasticity means that a solid has the ability to flow.