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Name: Natalie
Status: Student 
Grade: 9-12
Location: N/A
Country: United States
Date: Fall 2009


Question:
What is the pressure of the earth's outer core? What is the pressure of the earth's mantle? What is the pressure of the earth's crust?



Replies:
Natalie

Pressure: Earth's outer core: I actually am not sure about this one. It ranges between 140 GPa and 330Gpa, but not exactly.

Earth's inner core is about 330 to 360 GPa.

Earth's mantle:The base of the Earth's mantle is about 140 GPa. At about 700km depth the pressure is about 25 GPa. 11GPa at 380 km depth, and about 3 GPa at 100km depth.

Earth's crust: varies with depth, P=gpz, where g is the gravitational field intensity, z is depth, and p is density. The average density of the continents is about 2.7 g/cm^3. The depth of the continents can be up to about 70km. The average density of the oceanic crust is about 3.0 g/cm^3. The depth of the oceanic crust is about 10km. So, the crust ranges from about 1 kPa to about 25 kPa at the deepest parts.

Kim Adams



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