Oceanography Ch.2 Test 1

44 terms by nephtalie

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hydrothermal vents

divergent plate boundary

island arc

convergent plate boundary


Both convergent plate boundary & divergent plate boundary

oceanic trench

convergent plate boundary

rift valley

divergent plate boundary


Both convergent plate boundary & divergent plate boundary

ancient precursor of the Pacific Ocean


supercontinent 200 million years ago


depression along ridge axis

rift valley

study of changes in the character of oceans due to geographic changes


study of magnetism over geologic time



The relatively young age of the seafloor supports the idea that subduction must take place.


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.


New crust is formed at trenches and old crust is subducted at ridges.


The oldest rocks are located at mid-ocean ridges.


Earthquakes are common along fracture zones.


Deep focus earthquakes are often associated with deep-sea trenches.


The magnetic field of the Earth reverses itself each time magma erupts at a mid-ocean ridge.


Fast-moving spreading ridges tend to be more gently sloped than slow-moving ridges.


Deep-sea trenches are found at convergent plate boundaries.


At divergent plate boundaries, only shallow focus earthquakes can be found.

all the above.

Fossils found in sediments can be used to:

contours at around 2000 meters in depth.

All continents fit together with the least number of overlaps and gaps when the continents are matched along:

plants lived near the poles, but continents have drifted to current locations

Fossils of ancient polar plants are currently found near the equator because the:


Climate distribution on Earth is primarily controlled by:

evidence of constant ocean salinity.

All the following provide evidence for continental drift except:

pattern of alternating magnetic polarity of seafloor rocks.

Continental drift was confirmed through the study of the:

The magnetic pole wobbles, but stays near the geographic pole.

Which of the following statements best describes the relationship between Earth's geographic and magnetic poles?

the magnetic pattern on the seafloor.

Vine and Matthews determined that new ocean floor was being produced at ocean ridges by examining:

age of seafloor.

Confirmation of seafloor spreading was supported by the:

parallel to and symmetric about ocean ridges.

The seafloor magnetic pattern is be best described as:

thermal contraction of hot lithosphere.

Oceans become deeper moving away from ridges due to:


Differences in height between continental crust and oceanic crust are explained by:

The asthenosphere is composed of outer mantle material.

Which of the following statements is true of the asthenosphere?

The lithosphere is composed of the crust and the topmost portion of the outer mantle

Which of the following statements is true of the lithosphere?

increases in proportion to the distance.

Moving from oceanic ridge to oceanic trench, the thickness of the lithosphere:

subduction zones.

Deep ocean trenches are associated with:

moving over a hot spot.

The Hawaiian Islands are located where the Pacific plate is:

divergent boundary

The Mid-Atlantic Ridge is an example of a:

crest of the mid-ocean ridge

Which of the following is associated with divergent plate boundaries on the seafloor?

volcanic island arcs

Which of the following is characteristic of oceanic-oceanic convergent plate boundaries?

andesitic volcanoes

Which of the following is characteristic of oceanic-continental convergent plate boundaries?


hydrothermal vents, Hawaiian Islands, oceanic trench, Panamerica

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