Questions 14 and 15. Fill in blanks. Thank you for the help in advance!!!! Earth
ID: 291753 • Letter: Q
Question
Questions 14 and 15. Fill in blanks.Thank you for the help in advance!!!! Earth's Interior Most of the information we have a look at the figure below and answer the questions Tormation we have on the inside of the Earth has been gained through the study of seismic w ake Surtace 6000 Center 12 Velocity (um/sec) 13. The layer labeled A is the solid, rigid, upper zone of the Earth that includes the Gust_ and very upper The a imate P- portion of the wave velocity in this layer is km/sec. What happens to the P and S-wave velocities when they reach the boundary between Layer A and B? This layer is called the (circle one) Core, Mantle, km/sec. The S-wave velocity in this layer is 14. The layer labeled B is the plastic, semi-molten layer that the Earth's plates ride upon. This layer is called the ers It extends from the base of the lithosphere to about how many (circle one) Crust, Lithosphere kilometers deep (circle one) 180 km, 660 km, 2250 km. The velocity of the P and S wave increases or decreases (cirele one) as you go down through this layer. Why might that bet? What Why do you happens at the boundary between Layers B and C?, think that might be? 15. Layer C is called the Earth's and includes the lower part of the lithosphere, the asthenosphere, and reaches almost how far down into the Earth's interior (circle one) 1000 km, 3000 km, 5000 km. This layer consists of ultramafic minerals similar to the rockThe approximate velocity of P-waves increases to km/sec at the base of this layer. The velocity of S-waves reaches a maximum What happens to the S-wave as it reaches the boundary between Layer C & D? Why do you think of km/sec in this layer. What happens to the P-waves as they reach this boundary? that might be? 16. Layers D and Eare both part of the Earth 's Ceirele one) Core, Mamtle, Lithosphere. What happens to P-wave Based on all of your observations, do P-waves move faster through liquids or solids (circle one)?
Explanation / Answer
14) asthenosphere extends below the lithosphere upto the depth of 100-700km so answer would be 660 km .
The velocity of P and S wave Decrease in this layer because of presence of very small percentage of melt in the asthenosphere.Also the speed of Seismic waves depend on density, they travel faster in denser medium and therefore their speed decreases in the asthenosphere as its density is less than as compared to lithosphere.
What happens between layer B and C.?
Layer B is asthenosphere and layer Cis Mantle. The Asthenosphere is the part of the upper mantle that is involved in plate tectonics movements and isostatic adjustments. This happens because of the plastic nature of asthenosphere and relatively has low resistance which facilitates the tectonic movements.
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