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A9R18EC.tmp 4 - 2.2 Earth structure and dynamic 2.2...

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Prof. M. Fall - University of Ottawa 4 The inside of the Earth is made of 3 layers having different physical properties : The core The mantle: The earth’s crust Source: J.-P. Bardet 2.2 Earth structure and dynamic 2.2 Structure of the Earth (2) barb2ne 0- 40 km Crust barb2ne 40- 650 Upper mantle barb2ne 650-2900 Lower mantle barb2ne 2900-5150 Outer core barb2ne 5150-6378 Inner core The 3 layers of the Earth are: The core : Located in the center, it represents 17% of the volume of the Earth; the core is divided into inner core (solid) and outer core (liquid) The mantel: Represents the biggest volume of the Earth, 81%, and is divided into lower mantle (solid) and upper mantle (liquid). The later is mainly plastic except its upper part (solid) The Earth’s crust : Represents less than 2% by volume and is solid 2.2 Earth structure and dynamic 2.2 Structure of the Earth (3) Le dessin en couleur est du USGS Jean Vaillancourt 2.2 Earth structure and dynamic 2.2 Structure of the Earth (4) Layers with different chemical compositions Layers with different
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