Oceanography Ch.2 Test 1
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:
evidence of constant ocean salinity.
All the following provide evidence for continental drift except:
True
At divergent plate boundaries, only shallow focus earthquakes can be found.
True
Fast-moving spreading ridges tend to be more gently sloped than slow-moving ridges.
all the above.
Fossils found in sediments can be used to:
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:
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:
the magnetic pattern on the seafloor.
Vine and Matthews determined that new ocean floor was being produced at ocean ridges by examining:
crest of the mid-ocean ridge
Which of the following is associated with divergent plate boundaries on the seafloor?
andesitic volcanoes
Which of the following is characteristic of oceanic-continental convergent plate boundaries?
volcanic island arcs
Which of the following is characteristic of oceanic-oceanic convergent plate boundaries?
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 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?
island arc
convergent plate boundary
oceanic trench
convergent plate boundary
supercontinent 200 million years ago
Pangea
ancient precursor of the Pacific Ocean
Panthalassa
mountains
Both convergent plate boundary & divergent plate boundary
volcanoes
Both convergent plate boundary & divergent plate boundary
latitude
Climate distribution on Earth is primarily controlled by:
age of seafloor.
Confirmation of seafloor spreading was supported by the:
pattern of alternating magnetic polarity of seafloor rocks.
Continental drift was confirmed through the study of the:
True
Deep focus earthquakes are often associated with deep-sea trenches.
subduction zones.
Deep ocean trenches are associated with:
True
Deep-sea trenches are found at convergent plate boundaries.
isostasy
Differences in height between continental crust and oceanic crust are explained by:
False
Earthquakes are common along fracture zones.
increases in proportion to the distance.
Moving from oceanic ridge to oceanic trench, the thickness of the lithosphere:
False
New crust is formed at trenches and old crust is subducted at ridges.
thermal contraction of hot lithosphere.
Oceans become deeper moving away from ridges due to:
False
Paleomagnetism confirms that, at particular times in the geologic past, Earth has had more than one magnetic north pole.
False
The magnetic field of the Earth reverses itself each time magma erupts at a mid-ocean ridge.
False
The magnetic north pole has remained very close to the geographic North Pole through all of geologic time.
False
The oldest rocks are located at mid-ocean ridges.
True
The relatively young age of the seafloor supports the idea that subduction must take place.
parallel to and symmetric about ocean ridges.
The seafloor magnetic pattern is be best described as:
hydrothermal vents
divergent plate boundary
rift valley
divergent plate boundary
Word Analysis. Examine the five words and/or phrases and determine the relationship among the majority of words/phrases. Choose the one option that does not fit the pattern.
hydrothermal vents, Hawaiian Islands, oceanic trench, Panamerica
study of changes in the character of oceans due to geographic changes
paleoceanography
study of magnetism over geologic time
paleomagnetism
depression along ridge axis
rift valley