U3 Earth's Interior and Plate Tectonics

Question 1

Which is denser: continental crust or oceanic crust?

Answer 1

oceanic crust

Question 2

If the P-wave of an earthquake shakes a town 4 minutes after the earthquake starts at the epicenter, how far away is the town from the epicenter?

Answer 2

2,000 km

Question 3

Which layers of Earth’s interior are represented by letters A and B? See figure.

A) A is the crust and B is the rigid mantle.
B) A is the lithosphere and B is the asthenosphere
C) A is the asthenosphere and B is the crust.
D) A is the rigid mantle and B is the lithosphere

Answer 3

B

Question 4

What is the approximate velocity in kilometers/second of the P-waves at a depth of 1000 kilometers? See figure.
A) 6.2 km/s
B) 7.2 km/s
C) 11.3 km/s
D) 13.8 km/s

Answer 4

C

Question 5

Some locations within layer C have an inferred density of (see figure):
A) 3.4 g/cm3
B) 5.6 g/cm3
C) 11.5 g/cm3
D) 12.9 g/cm3

Answer 5

D

Question 6

The cross section below represents a portion of Earth’s interior beneath point Y. On this cross section,
draw an arrowhead on each of the four bold lines, to represent the direction of the convection currents
in the asthenosphere.

Answer 6

Question 7

See figure

Answer 7

D

Question 8

What are the 3 TYPES of plate boundaries?

Answer 8

divergent, convergent, and transform

Question 9

subduction

Answer 9

when a denser plate collides with a less dense plate and the dense plate moves under the less dense plate