What is currently the dominant type of motion along the northem boundary of the Caribbean plate?

A. subduction of the Caribbean plate beneath Cuba

B. subduction of the Gulf of Mexico beneath the Caribbean plate

C. subduction of the Caribbean plate beneath the volcanoes of Central America

D. seafloor spreading that is moving North America farther from South America

E. a long transform fault moving the Caribbean plate eastward relative to North America

Which of the following is associated with a typical island arc?

A. oceanic trench

B. subduction

C. melting in the mantle

D. ocean-ocean convergence

E. all of these

This map shows plate boundaries in the Caribbean region. Which number is closest to a subduction zone that has formed an island arc?

A. 1

B. 2

C. 3

D. 4

E. 5

What regional effects influence continental interiors?

A. rises and falls in sea level related to changes in global climate

B. stresses transmitted from distant plate boundaries and mountain belts

C. preexisting fault that can be activated by stresses, causing faulting and folding

D. all of these

What is the ultimate source of food for animals living around deep-sea hydrothermal vents?

A. sunlight and photosynthesis

B. the decay of creatures that float on the ocean surface and settle to the bottom

C. nuclear energy from the heated uranium-rich rocks

D. bacteria that break down hydrogen sulfide

Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain?

A. The oceanic lithosphere cools and becomes denser.

B. The weight of sediments depresses the oceanic crust.

C. The oceanic plate is flexed downward near a subduction zone.

D. Slab rollback pulls the oceanic lithosphere deeper.

Which of the following letters marks the Red Sea?

A. A

B. B

C. C

D. D

E. E

Island arcs are curved because:

A. the shapes of the continents were arcuate as they rifted apart

B. the shape of the mid-ocean ridge matches the shape of the continents

C. Earth is a sphere, not a flat plane

D. most terranes added to the continental margin are circular

Solve the following exercise.

Without using elimination, find dimensions and bases for the four subspaces for

$$A=\left[\begin{array}{llll} 0 & 3 & 3 & 3 \\ 0 & 0 & 0 & 0 \\ 0 & 1 & 0 & 1 \end{array}\right] \quad \text { and } \quad B=\left[\begin{array}{l} 1 \\ 4 \\ 5 \end{array}\right]$$

What rock type is produced by the partial (5-10%) melting of ultramafic mantle peridotite rock?

Which of the following features is NOT present near the present-day Caribbean?

A. a subduction zone

B. an island arc

C. a long transform fault

D. reefs

E. all of these are present

What rock type is produced by the partial (5-10%) melting of ultramafic mantle peridotite rock?

Which of the following characteristics are NOT used to classify and name clastic sediments?

A. the size of the clasts

B. the amount of sorting of clasts

C. the shape of the clasts

D. the climate in which the clasts are produced

E. all of these are used

This map shows plate boundaries in the Caribbean region. Which number is closest to a transform boundary?

A. 1

B. 2

C. 3

D. 4

E. 5