Chapter 2 Plate Tectonics and the Ocean Floor Soldado
Which of the following is characteristic of ocean-continental convergent plate boundaries?
Andesitic volcanoes
Depression along ridge axis
Rift Valley
At divergent plate boundaries, only shallow focus earthquakes can be found
TRUE
Deep focus earthquakes are often associated with deep-sea trenches
TRUE
Fast-moving spreading ridges tend to be more gently sloped that slow-moving ridges
TRUE
The relatively young age of the seafloor supports the idea that subduction must take place
TRUE
Which of the following statements is true of the asthenosphere?
The asthenosphere is composed of outer mantle material
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
Super continent 200 million years ago
Pangea
Ancient precursor of the Pacific Ocean
Panthalassa
Volcanoes
Convergent & Divergent Boundary
Island Arc
Convergent Plate Boundary
Mountains
Convergent Plate Boundary
Oceanic Trench
Convergent Plate Boundary
Rift Valley
Divergent Plate Boundary
hydrothermal vents
Divergent Plate Boundary
Deep-sea trenches are found at convergent plate boundaries
FALSE
Earthquakes are common along fracture zones
FALSE
New crust is formed at trenches and old crust is subducted at ridges
FALSE
Paleomagnetism confirms that a particular times in the geologic past Earth has had more than one magnetic north pole
FALSE
The magnetic field of the Earth reverse itself each time that 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
FALSE
Fossils found in sediments can be used to:
Indicate the relative age of the sediments, provide evidence for plate movement, suggest ancient climate characteristics & support the idea that land masses were joined
Study of changes in the character of oceans due to geographic changes
Paleoceanography
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.
Which of the following statements best describes the relationship between Earth's geographic and magnetic poles?
The magnetic pole wobbles, but stay near the geographic pole
Confirmation of seafloor spreading was supported by the
age of seafloor
Which of the following is associated with convergent plate boundaries on the seafloor?
deep sea trenches and deep focus earthquakes
The Mid-Atlantic Ridge is an example of a
divergent boundary
The Hawaiian Islands are located where the Pacific Plate is:
moving over a hot spot
Moving from oceanic ridge to oceanic trench, the thickness of the lithosphere:
increases in proportion to the distance
Differences in height between continental crust and oceanic crust are explained by:
isostasy
Climate distribution on Earth is primarily controlled by:
latitude
Continental drift was confirmed through the use of the
location of magnetic poles through geologic time
The seafloor magnetic pattern is best described as :
parallel to and symmetric about ocean ridges
Which of the following is characteristic of oceanic-oceanic convergent plate boundaries?
volcanic island arcs
All of the following provide evidence for continental drift EXCEPT
seafloor magnetic pattern
Deep ocean trenches are associated with
subduction zones
Vine and Matthews determined that new ocean floor was being produced at ocean ridges by examining
the magnetic pattern on the seafloor
Oceans become deeper moving away from ridges due to
thermal contraction of hot asthenosphere
