What information do you need to calculate the pressure (weight) of a column of rock? Calculate the pressure at the base of oceanic and continental crust for columns of rock that are one square meter in area at the surface
What will be an ideal response?
In order to calculate the pressure (weight) of a column of rock you need to know the volume of the column, the density of the rock, and the acceleration of gravity.
Oceanic crust
Volume = 7,000 m3
Density = 2.7 g/cm3 = 2,700 kg/m3
Gravity = 9.81 m/s2
Weight = 7,000 m3 x 2,700 kg/m3 x 9.81 m/s2 = 185,409,000 Newtons or 41,681,600 lbs
Continental crust
Volume = 35,000 m3
Density = 3.0 g/cm3 = 3,000 kg/m3
Gravity = 9.81 m/s2
weight = 35,000 m3 x 3,000 kg/m3 x 9.81 m/s2 = 1,030,050,000 Newtons or 231,564,450 lbs
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