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What would a study of the East Pacific rise (a mid-ocean ridge) indicate about the age of the basaltic bedrock in this area?
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
Oceanic crust is sliding beneath the Aleutian Islands in the North Pacific Ocean, forming the Aleutian Trench at a
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
Which inference can best be made from the diagram?
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
According to the diagram, what is the approximate rate of seafloor spreading?
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
According to the diagram, the deep trench along the west coast of South America is caused by movement of the oceanic crust that is
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
The occurrence of high-heat floors at the ridge center provides evidence of the
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
As distance from the center of the ridge increases, the age of the rocks
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
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?
The orientation of the Earth's magnetic field has reversed with time.
increases
sinking beneath the continental crust
40 km/million years
existence of rising mantle convection currents
convergent plate boundary between the Pacific Plate and the North American Plate
The bedrock is youngest at the ridge.
D
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