Which crustal feature is located at approximately 150N & 700W?

1) Hawaii Hot Spot 2) East African Rift

3) Peru-Chile Trench 4) Caribbean Plate

The basaltic bedrock of the oceanic crust isclassified as…

(1) felsic, with a density of 2.7 g/cm3

(2) felsic, with a density of 3.0 g/cm3

(3) mafic, with a density of 2.7 g/cm3

(4) mafic, with a density of 3.0 g/cm3

Which part of Earth’s interior is inferred to be the most dense?

(1) rigid mantle

(2) asthenosphere (3) outer core (4) inner core

Which part of Earth’s interior is inferred to be principally Iron & Nickel?

(1) rigid mantle (3) stiffer mantle

(2) asthenosphere (4) inner core

Which part of Earth’s interior is inferred to have convection currents that cause tectonic plates to

move?

(1) rigid mantle (3) outer core

(2) asthenosphere (4) inner core

Which part of Earth’s interior is inferred to be divided into two parts by the MOHO?

(1) rigid mantle (3) lithosphere

(2) asthenosphere (4) inner core

What is Earth’s inferred interior pressure, in millions of atmospheres, at a depth of 4500

kilometers?

(1) 1.9 (3) 5500

(2) 2.7 (4) 6500

What is Earth’s inferred temperature at the Inner Core/Outer Core Interface?

(1) 1900oC (3) 5500oC

(2) 2700oC (4) 6300oC

Base your answers to the questions on the cross section below, which shows a portion of Earth’s interior layers and the location of an earthquake

epicenter. Letter A represents a seismic station on Earth’s surface. Letter B represents a location in

Earth’s interior.

Explain why seismic station A receives P-waves but not S-waves from this earthquake.

What is the approximate depth at location B?

2900 Km

Because S-waves cannot pass throughThe liquid outer core.

On the map

points A through

D represent locations

on Earth’s surface.

Which location is positioned over a mantle hot spot?

(1) A (3) C

(2) B (4) D

During the Jurassic period of the Mesozoic era, convection currents in Earth’s mantle

1) broke apart Pangaea

2) caused metamorphism of the Adirondacks

3) uplifted the Adirondack region

4) separated Africa and North America

Between which two lithospheric plates could this boundary be located?

(1) South American Plate and African Plate

(2) Scotia Plate and Antarctic Plate

(3) Nazca Plate and South American Plate

(4) African Plate and Arabian Plate

Compared to the continental crust, the oceanic crust is

(1) less dense and thinner

(2) less dense and thicker

(3) more dense and thinner

(4) more dense and thicker

The map shows the location of North Island in New Zealand. The block diagram shows a portion of North Island. The Hikurangi Trench is shown forming at the edge

of the Pacific Plate. Point X is at the boundary between the lithosphere and the asthenosphere.

State the approximate temperature at point X.

1000o C

Describe the type of tectonic plate motion that formed the Hikurangi Trench.

Convergence (Subduction)

This trench is a boundary where two plates meet. NAME the tectonic plate that is less dense.

Indian-Australian Plate

According to the map, how long after this earthquake did the first

tsunami wave arriveat Bengkulu, Sumatra?

About 1.6 hours.What are the approximate terrestrial coordinates of

the earthquake epicenter?

3 or 4o N & 96o E

The arrival of P-waves and S-waves at a seismic station indicate an epicenter distance of 2800 Km.

1) 09:05:20 3) 09:22:202) 09:09:40 4) 09:34:40

If the P-wave arrived at 09:18:00, when did the S-wave from the quake arrive?

Difference in arrival times is 04:20!

The arrival of P-waves and S-waves at a seismic station indicate an epicenter distance of 1400

Km.

1) 15:25:30 3) 15:27:00

2) 15:32:23 4) 15:39:30

If the P-wave arrived at 15:42:30, when did the earthquake occur?

1400 km takes a P wave 3 minutes!

According to the seismogram, when did the first P-waves arrive at this seismic station?

(1) 3 minutes after an earthquake occurred 2,600 km away(2) 5 minutes after an earthquake occurred 2,600 km away(3) 9 minutes after an earthquake occurred 3,500 km away(4) 11 minutes after an earthquake occurred

3,500 km away

The arrival time of the first earthquake P-wave at a seismograph station was 10:11:20(hours:minutes:seconds).

If the epicenter of the earthquake is 8000 km away, what was the approximate arrival time of the first S-wave from this earthquake?

(1) 10:02:00 (3) 10:20:40

(2) 10:09:20 (4) 10:32:00

Earth’s inner core is inferred to be solid based on the analysis of

(1) seismic waves

(2) crustal rocks

(3) radioactive decay rates

(4) magnetic pole reversals

The diagram here was completed by

a seismologist.

The earthquake’s epicenter is closest

to location

(1) A (3) C

(2) B (4) D