HEAT FLOW 1) To what depth are temperatures in the Earth affected by the ice age
ID: 1836524 • Letter: H
Question
HEAT FLOW
1) To what depth are temperatures in the Earth affected by the ice ages? (List all assumptions)
2) It takes aout 4 min. to boil a 60 g hen's egg to make it edible for most people. For how long would it be advisable to boil an osterich egg which weighs about 1.4 kg? (List all assumptions)
Viscosity of the mantle (adapted from Turcotte & Schubert, p. 248 - 249) It is estimated that the ice sheet over Hudson Bay, Canada had a thickness of 2 km. At the present time there is a negative free-air gravity anomaly in this region of 0.3 mm/s^2. In other words, the gravity is 0.3 mm/s^2 less than expected at this distance from the center of the Earth. Assuming that the ice (density of 1000 kg/m^3) was in isostatic equilibrium and displaced mantle rock with a density of 3300 kg/m^3, determine the depression of the land surface w_mo. Assuming that the negative free-air gravity anomaly is due to incomplete rebound, determine w at the present time. Applying the exponential rebound analysis discussed in class (omega = omega_0 exp(-t/tau)), determine the relaxation time tau = 4pieta/rhoglambda and use it to determine the mantle viscosity. Assume that the ice sheet melted 10,000 years ago and that the appropriate wavelength for the Hudson Bay ice sheet was 5000 km. Make a graph of your solution for omega = omega_0exp(-t/tau) versus timeExplanation / Answer
1)
The ice age affected the earth's crust. The thickness of the earth's crust increased as the sea levels are low at the time of ice age, the magma that flows from mid-ocean ridges flows and solidified quickly. This resulted in the increase of the oceanic crust thickness. Thus the the ice age influenced the temperatures of the earth to the greater depth of the crust.
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