associated with the interactions of tectonic plates? Explain your answer (15 points). the theory that most earthquakes a

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Associated With The Interactions Of Tectonic Plates Explain Your Answer 15 Points The Theory That Most Earthquakes A 1 (38.47 KiB) Viewed 186 times

Associated With The Interactions Of Tectonic Plates Explain Your Answer 15 Points The Theory That Most Earthquakes A 2 (36.66 KiB) Viewed 186 times

associated with the interactions of tectonic plates? Explain your answer (15 points). the theory that most earthquakes are Based on scientific experiment data, seismic waves travel faster through denser materials. Rocks rich in silicon (felsic rocks) that make up the Earth's crust are less dense than the Earth's mantle that is rich in iron and magnesium (mafic or basaltic). The density of rocks increases as their iron and magnesium content increases P and S waves also travel faster through rocks with higher elasticity. Solid rocks tend to have higher elasticity than liquid. P-waves can travel through solid, liquid and gas whereas Swaves only travel through solid rocks. Based on the basic properties of seismic waves summarized above, answer the following questions related to Figure 6.9 in Lab Exercise 6. 7. Based on seismology, why do scientists believe that the density of the Earth's mantle (t layer shown as red in Figure 6.9) increases as depth increases? Explain your answer (1 points).
Q A N2 Z 8. Based on the changes of velocities for both P and S waves shown on Figure 6.9, how did geologists discover the existence of asthenosphere underneath lithosphere? Explain your answer (15 points). 9. Based on the changes of S wave velocity through the Earth's interior shown on Figure 6.9, how do scientists know that the Earth's outer core may be composed of liquid whereas the asthenosphere might not completely be liquid? Explain your answer (15 points). 10. Seismic wave velocities change abruptly (not smoothly) when the waves travel through two types of rocks with significantly different densities. As shown by both P and S wave velocity curves on Figure 6.9, the changes of seismic wave velocities through the upper mantle (deep red zone) are not smooth (kinked curves) before they enter the lower mantle (red color zone). What do the smooth and non-smooth changes of P and S wave velocities tell us the difference between the Earth upper and lower mantle in density change? Explain your answer (15 points).