The Atlantic is a passive margin, and the Pacific is an active margin

Which of the following correctly describes the Atlantic and Pacific continental margins?

The shelf represents the flooded portions of continents.

Choose the true statement regarding the continental shelf.

canyons

Turbidity currents travel from the shelf through __________, creating deep sea fans.

Volcanism is primarily found at divergent and convergent plate boundaries. Most seismicity occurs along plate boundaries of all three types.

Relationship of volcanism and seismicity to plate tectonics:

subduction erosion

If the subduction angle is steep, the overriding plate may undergo __________.

Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.

Which of the following is true regarding shallow subduction angles?

New oceanic crust and lithospheric mantle are generated by the cooling of molten rock upwelling from the mantle

What happens as plates diverge at an oceanic ridge?

Layer 2: Basalt pillow lavas and Layer 4: gabbro

 What two layers of the ophiolite sequence are compositionally similar, but formed in different areas with respect to the crust?

mantle peridotite
gabbro
sheeted dike complex
Basaltic pillow lavas
deep-sea sediments

Which of the following contains the entire ophiolite suite, in order from the mantle to the seafloor?

a relatively smooth swell with gentle slopes

What are the features associated with a divergent boundary that is spreading quickly?

The Mid-Atlantic Ridge is spreading at a much slower rate than the East Pacific Rise.

Which of the following accurately compares the Mid-Atlantic Ridge and East Pacific Rise?

crustal upwarp
rift valley
linear sea
ocean

Name the correct order of rifting events.

linear sea

The Gulf of Aden represents which part of the rifting sequence?

flood basalt formation

The timing of __________ and continental breakup strongly correlate.

seamount chains

What feature connects the South American Paraná and African Entedeka flood basalts?

volcanic rocks
classic sedimentary rocks
deep sea sedimentary rocks

What sequence of rocks would you expect rift valley evolution to produce, from oldest to youngest?

It was an oceanic plate that used to exist between the Pacific and North American Plates.

Which of the following is a true statement regarding the Farallon Plate

convergent; transform

The plate boundary in the U.S. Pacific Northwest is _____, while most of the California coast is characterized by a _____ plate boundary.

Both are located on the Pacific Plate

Which statement regarding Baja Mexico and the city of Los Angeles is correct?

a right lateral sense of motion

Strike-slip faulting of the Queen Charlotte and San Andreas fault systems shows __________.

The San Andreas and Queen Charlotte Faults were established where it was subducted beneath the North American plate

What happened to the Farallon Plate approximately 20 million years ago?

two landmasses collide

Which of the following scenarios could result in the development of a compressional mountain belt?

folds
intrusive igneous rocks
thrust faults

Which geologic features would be present in compressional mountain belts? (Note: There may be more than one answer.)

schist

Which of the following rocks are characteristic of compressional mountain building?

young mountain belts

Using the map provided in Figure 1, in which province would the Rocky Mountains of the United States be located?

Taconic, Acadian, and Alleghanian

Which of the following orogenies helped to create the Appalachian Mountains?

The Iapetus Ocean closed during the Alleghanian Orogeny.

Which event marked the creation of the supercontinent Pangaea?

Valley and Ridge

Which of the Appalachian Mountain Belt Provinces are visible in the circled area of Figure 1?

Coastal Plain

Which of the following geographic provinces is the newest addition to the North American continent?

Himalayas

Which mountain range marks the boundary between the Indian and Eurasian Plates?

Continent-Continent Convergent Boundary

What kind of tectonic boundary is currently responsible for creating the Himalayas?

thrust faults
thicker continental crust

What geologic features were created in the Eurasian Plate when India underthrust beneath it?

strike-slip faults

As India moves northward, China and Southeast Asia are being relocated to the east and southeast because of "escape tectonics." What feature is allowing them to "escape"?

The Indian Plate is too buoyant.
The Indian Plate is too thick.

When the Indian Plate collided with Eurasian Plate, why didn't it subduct?

a mass of rock that formed elsewhere and was added to a continent

A terrane is __________.

convergent boundary

Which tectonic boundary is associated with the addition of terranes to a continent?

accretion

What is the name of the process by which terranes are added to continents?

Yukon-Tanana

Using the map in Figure 1, determine which of the named terranes accreted earliest to North America.

Iapetus Ocean Island Arc and sediments
the Avalon Terrane
and a remnant of Africa

The map in Figure 2 is a cross-section of the North American continent 600 million years ago and after the break-up of Pangaea approximately 200 million years ago. Which material(s) had been accreted to North America as terranes?