The deepest exploration drill hole in the world is less than 30 km deep. Given t

Question

The deepest exploration drill hole in the world is less than 30 km deep. Given that, how can we possibly know anything about the structure and composition of the deep Earth interior? First, draw a figure of the Earth's interior, and shadow zones. Second, answer the question and in your answer be sure to include an explanation of both the S-wave and P-wave shadow zones, and show wave ray paths. Consider the Earth's mass to be at steady state. Assume the lithosphere has a mass of M. New lithosphere is being produced at the divergent plate boundaries with a volume flux of L. The density of the new lithosphere is D. would you compute the residence time, T, of average rock that goes through the rock cycle? First show the equation you will use with the symbols supplied above, and show all units. Next, use the following values to compute T, and show units. M = 6.0 Times 1024 kilograms L = 21 cubic kilometers per year D = 3.0 Times 1015 kilograms per cubic kilometer Given your estimate of T above, explain why there are rocks on Earth surface that are more than 10 times T. This is the same type of exercise as in the "Systems" lab. Explain how radiometric dating works. Be sure to include terms like isotope, parent, daughter, half life? Why is it that carbon 14 can only be used to date carbon bearing materials that are less than 45,000 years old.

Explanation / Answer

1) Earth's inetrior is studied by seismic waves . There are energy that travel trough the earth and they moves similarly to the other of the waves like sound waves. Seismic waves are sent throught the earth during earthquakes . these are recorded on seismograph and seismographs.

There are two types of body waves, called P waves and S waves. P stands for primary waves because these waves travel the fastest and are detected first. S stands for secondary wave because these are slower than P waves, arriving second on the seismogram.

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