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The magnetic north pole has remained very close to the geographic north pole through all of geologic time?
Paleomagnetism confirms that at particular times in the geologic past Earth has had more than one magnetic north pole?
The magnetic field of the Earth reverses itself each time that magma erupts at a mid-ocean ridge?
Abyssal plains are more extensive on the floor of the Atlantic as compared those on the floor of the Pacific?
Sediments of the continental rise can exhibit characteristics similar to those formed by rivers on land?
The deepest portions of the ocean are part of the relatively narrow features called submarine canyons?
Due to the very harsh environment, few organisms are found in association with hydrothermal vents?
Calcareous shells will not accumulate on the ocean floor when the water depth exceeds about 4500 meters ( around 15,000 feet.) ?
Organisms that live on the ocean floor may be responsible for keeping manganese nodules from being buried in the sediment?
Fossils found in sediments can be used to?
Indicate the relative age of sediments, provide evidence for plate movement, suggest ancient climate characteristics, and support the idea that land masses were joined.
All continents fit together with the least number of overlaps and gaps when the continents are matched along?
contours at around 2000 meters in depth.
Fossils of ancient polar plants are currently found near the equator because the?
plants lived near the poles, but land masses have drifted to current locations.
Continental drift was confirmed through the use of the?
location of magnetic poles through geologic time.
Which of the following statements best describes the relationship between earth's geographic and magnetic poles?
the geographic pole wobbles, but stays near the magnetic pole.
Vine and Matthews determined that new ocean floor was being produced at ocean ridges by examining?
the magnetic pattern on the seafloor
The seafloor magnetic pattern is be best described as?
parallel to and symmetric about ocean ridges.
Which of the following statements is true of the asthenosphere?
The asthenosphere is composed of outer mantle material
Which of the following statements is true of the lithosphere?
The lithosphere is composed of the crust and the topmost portion of the outer mantle
Moving from oceanic ridge to oceanic trench, the thickness of the lithosphere?
increases in proportion to the distance
Which of the following is associated with divergent plate boundaries on the seafloor?
offset of the mid-ocean ridges
Which of the following is characteristic of oceanic-oceanic convergent plate boundaries?
volcanic island arcs
Which of the following is characteristic of oceanic-continental convergent plate boundaries?
The two relatively flat areas on the hypsometric curve represent?
some interior continental areas/ coastal plains and abyssal plains
The method that is most frequently used to investigate sediment and rock layers of the sea floor is?
Satellites are used to map the ocean floor because they?
are unaffected by surface weather,can cover areas where ships have not produced surveys, can "see" large areas of the seafloor at one time, and the shape of the ocean surface itself reflects large features on the seafloor below
Characteristics of active continental margins include all of the following?
broad continental shelf.
The correct order of marine provinces from the coast to the mid-ocean ridge is?
shelf, slope, rise, abyssal plain.
Directly seaward of the continental shelf is a more steeply sloping region called the?
Abyssal hills are only visible in the Pacific Ocean because?
they are higher in the Pacific than in the other ocean basins
The direction of motion along a seafloor transform fault is?
in the same direction as the plates are spreading.
What are the important factors in control on oceanic sediment accumulation?
degree of preservation, dilution, input from other sediment types, and rate of deposition
High energy environments are most likely to contain which one of the following?
large particles such as gravel
Sediments that are poorly sorted and made of a variety of minerals could have been deposited by?
The element found in some sediments that suggests that a meteorite or asteroid impact occurred nearby is?
The most likely place to find abundant manganese nodules is on the?
abyssal plain far from a continent.
In contrast to manganese nodules, which form on the abyssal plain, phosphate-rich nodules form in?
intermediate to shallow depth water.
A pelagic clay contains material that settles to the seafloor through the water column and is?
less than 30% biogenous material
An important way to increase the settling rate of fine biogenous particles in the open ocean is via?
All the following are TRUE concerning the deepest part of the ocean except:?
The depth of the trench is estimated at 12,500 m
The separation of the Earth into layers was the result of the?
differing densities of the rock and mineral materials.
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