Earth-part I - "ET phone home" The Earth's...

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“ ET phone home”
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The Earth’s interior, movement of its crust, and its magnetic field
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The layers of the earth are comprised of four main regions: the crust, the mantle and the liquid and solid cores Melting during the early stages of the earth’s formation caused denser elements to sink toward the center, and lighter elements to move into the crust. This is known as planetary differentiation . Fe-Ni Fe-Ni silicate rock solid rock
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km 6370 km crust mantle liquid outer core solid inner core 3500 km 1200 km Upper mantle ~ 70 km thick + crust is called the lithosphere. At the bottom of this region T is great enough to melt the mantle. This melted portion of the mantle is called the aesthenosphere. The lithosphere floats on the aesthenosphere It extends to a depth of 250 km, and flows like putty. Volcanic lava has its origin in this region. Below the aesthenosphere the mantle again becomes solid. The high pressure compresses rock to form other denser minerals. Deepest drill hole is 12 km
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Earth-part I - "ET phone home" The Earth's...

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