13) Which of the following materials will allow for the fastest transmission of
ID: 113003 • Letter: 1
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13) Which of the following materials will allow for the fastest transmission of seismic waves? A) Rigid, less compressible material B) Material that has been slightly heated C) Partially molten material D) Molten material 14) What is diffraction? A) A seismic wave is bounced back toward its source B) A seismic wave is bent when moving from one material to another C) A seismic wave is bent when it passes by a curved surface. D) Seismic waves are separated by liqaids 15) Why do seismic waves follow strongly curved paths as they move through the interior? A) Their paths are altered by changes in temperature B) Their paths are altered by reflection off dense materials. C) Their velocities are altered by changes in chemistry D) Their velocities are changed because of increasing pressure with depth. km/sec, but once 16) P waves moving through the base of continents move at about they cross the Moho, the velocity char to A) 8:4 B) 2; 10 C)6;8 D)3:9 17) What is the average thickness of the oceanic crust? A) 4 km B) 7 km C) 40 km D) 70 km 18) Where is the thinnest continental crust in North America? A) Appalachian Mountains B) Mississippi River Valley C) Basin and Range region D) Colorado Plateau 19) Where is the thickest continental crust in North America? A) Appalachian Mountains B) Rocky Mountains C) Basin and Range regiorn D) Great Basin 20) Where is oceanic crust generated? A) Along divergent plate boundaries B) Where volcanic lava meets the sea C) Where continents collide 16 Copyright © 2017 Pearson Educatim, Inc.Explanation / Answer
13) option a- Rigid, less compressible material
seismic waves travel fastest through solids , so a rigid material which is less compressible will be the fastest mode of travel.
14) option b- A sesismic wave is bent when moving from one medium to another.
15) optoin c- velocities are altered because of change in chemistry
while moving through the interior, the change in medium is responsible for the bending of the waves, which is because of change in chemistry.
16) option c- 6:8
p waves move through the crust at about 6 km/sec which make option c correct.
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