Seafloor Spreading Question Preview (ID: 56791)

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According to the diagram, the deep trench along the west coast of South America is caused by movement of the oceanic crust that is

a) sinking beneath the continental crust

b) uplifting over the continental crust

c) colliding with the Atlantic oceanic crust

d) sinking at the Mid-Atlantic ridge

Which cross-sectional diagram of a portion of the crust and mantle best shows the pattern of mantle convection currents that are believed to cause the formation of a mid-ocean ridge?

a) A

b) B

c) C

d) D

Mid-ocean ridges (rifts) normally form where tectonic plates are

a) converging

b) diverging

c) stationary

d) sliding past each other

The occurrence of high-heat floors at the ridge center provides evidence of the

a) destruction of oceanic crust

b) destruction of continental crust

c) existence of ancestral mountains

d) existence of rising mantle convection currents

According to the diagram, what is the approximate rate of seafloor spreading?

a) 1 km/million years

b) 2 km/million years

c) 40 km/million years

d) 50 km/million years

As distance from the center of the ridge increases, the age of the rocks

a) decreases

b) increases

c) remains the same

d)

Which inference can best be made from the diagram?

a) The orientation of the Earth's magnetic field has reversed with time.

b) The size of the continents has changed with time.

c) The elevation of sea level has changed with time.

d) The amount of fossil material preserved in the igneous rock has changed with time.

What would a study of the East Pacific rise (a mid-ocean ridge) indicate about the age of the basaltic bedrock in this area?

a) The bedrock is youngest at the ridge.

b) The bedrock is oldest at the ridge.

c) The bedrock at the ridge is the same age as the bedrock next to the continent.

d) The bedrock at the ridge is the same age as the bedrock at the San Andreas fault.

Crustal formation, which may cause the widening of an ocean, is most likely occurring at the boundary between the

a) African Plate and the Eurasian Plate

b) Pacific Plate and the Philippine Plate

c) Indian-Australian Plate and the Antarctic Plate

d) South American Plate and the North American Plate

Oceanic crust is sliding beneath the Aleutian Islands in the North Pacific Ocean, forming the Aleutian Trench at a

a) convergent plate boundary between the Pacific Plate and the North American Plate

b) convergent plate boundary between the Pacific Plate and the Juan de Fuca Plate

c) divergent plate boundary between the Pacific Plate and the North American Plate

d) divergent plate boundary between the Pacific Plate and the Juan de Fuca Plate

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