Answer whatever questions you know Question 5 The size and shape of Earth\'s cor

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Answer whatever questions you know

Question 5

The size and shape of Earth's core can be measured by information from the A) Earth's magnetic field.

B) S-wave shadow zone.

C) P-wave shadow zone.

D) nature of meteorites.

Question 6

Part of Earth's core is believed to be liquid as indicated by information from the

A) P-wave shadow zone.

B) S-wave shadow zone.

C) Earth's magnetic field.

D) nature of meteorites.

Question 7

The Earth's crust

A) makes up about one-third of the mass of Earth.

B) is only found in continents.

C) exists below the oceans and make up the continents.

D) supports the asthenosphere, which floats in the crust.

Question 8

Earth's magnetic field

A) occasionally undergoes magnetic reversal, flipping the poles.

B) is and always has been stable and with a constant orientation.

C) will cease to exist forever within the next 2,000 years.

D) none of the above.

Question 9

The least dense rocks are found in

A) continental crust.

B) oceanic crust.

C) the mantle.

D) the core.

Question 10

The asthenosphere is

A) the uppermost layer of the mantle.

B) a plastic layer in the upper mantle.

C) the boundary between the mantel and the core.

D) the solid, dense layer below the moho.

Question 11

Which of the following statements about seismic waves is not true?

A) In a P-wave the material vibrates back and forth in the same direction as the direction of wave motion.

B) Both P-waves and S-waves travel readily through molten rock.

C) P-waves move more rapidly than S-waves.

D) Seismic waves are reflected at boundaries between layers of rocks with different densities.

Question 12

Which of the following statements about Earth's core is true?

A) Once molten, the core has gradually solidified as it cooled.

B) P-waves cannot travel through this layer of Earth.

C) The core makes up about 1/3 of Earth's volume.

D) the core is mostly made of iron.

Question 13

The theory of plate tectonics describes sea-floor spreading as occurring at a

A) divergent boundary.

B) subduction zone.

C) convergent boundary.

D) transform boundary.

Question 14

Earthquakes in California that occur along the San Andreas fault are associated with a

A) subduction zone.

B) transform boundary.

C) convergent boundary.

D) divergent boundary.

Question 15

Volcanic mountains on the land and along a coast usually means a A) ocean-ocean plate convergence.

B) continent-continent plate convergence.

C) ocean-continent plate convergence.

D) none of the above.

Question 16

New crustal material is produced where according to the theory of plate tectonics? A) divergent plate boundaries

B) subduction zones

C) ocean-continent plate convergence

D) ocean-ocean plate convergence

Question 17

The average rate of sea-floor spreading that occurs along the Mid-Atlantic ridge is about

A) 5 cm/yr

B) 23 m/yr

C)0.0003cm/yr

D) 234 m/yr

Question 18

When the lithosphere of one plate is subducted beneath a second plate, the subducted material does not become

A) new mantle material.

B) lava that is erupted from volcanoes.

C) a body of granite below the surface.

D) part of the outer molten core

The size and shape of Earth's core can be measured by information from the A) Earth's magnetic field.

B) S-wave shadow zone.

C) P-wave shadow zone.

D) nature of meteorites.

Explanation / Answer

5) P waves shadow region (C)

The path of p waves can be accurately calculated, so the size and shape of the earth's core can also be calculated be accurately calculated.

6) S wave zone (B)

The S-wave shadow zone is formed because S-waves cannot travel through the earth's core. This, and other seismic data indicate that the outer part is liquid, or at least it acts like a liquid.

7) exists below the oceans and make up the continents (C)

8) occasionally undergoes magnetic reversal, flipping the poles. (A)

9) continental crust (A)

10) The upper most layer of the mantle (A)

11) Both P-waves and S-waves travel readily through molten rock. (B)

12) the core is mostly made of iron.(D)

13) divergent boundary. (A)

14)  transform boundary. (B)

15)  ocean-continent plate convergence. (C)

16)  divergent plate boundaries (A)

17) 2.5 cm/yr (A)

18) part of the outer molten core (D)

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