Plate Tectonics
Identify a process occuring in the plastic mantle that is inferred to cause tectonic plate motion
Convection Circulation
Which two Earth layers are separated by the Moho boundary?
Crust and rigid mantle
Which type of tectonic plate boundary is located at mid ocean ridges
divergent
Which cross section best represents the magnetic field pattern west of the Mid-Atlantic Ridge?
A
The interior of Earth between a depth of 5200 kilometers and 6300 kilometers is inferred to be composed mostly of
iron and nickel
The formation of the canary Islands was primarily caused by their location near a
mantle hot spot
At the time represented by this drawing, the region now known as the New York State was inferred to be located
near the equator
Compared to the Earthś continental crust, Earthś oceanic crust is
thinner and more dense
The Indian- Australian plate is moving
toward the Pacific Plate
What is the primary geologic process occuring along the San Andreas Fault
transform movement
In which Earth layer are most convection currents that cause seafloor spreading thought to be located
asthenosphere
Earths outer core and inner core are both inferred to be
composed of a high percentage of iron
Alternating parallel bands of normal and reversed polarity are found on either side of a
Mid-Atlantic Ridge
Which geologic feature is composed of the youngest crustal bedrock?
Mid-Atlantic Ridge
Which two tectonic plates are separated by a mid-ocean ridge?
North American and Eurasian
Which statement supports the theory of continental drift
The present continents appear to fit together as pieces of a larger landmass
Which cross section shows the inferred movement of material in the asthenosphere beneath points X and Y?
C
In which cross section do the arrows best show the convection occurring within the asthenosphere line XY?
B
Which letter best represents Earthś mantle
B
Which map best represents the pattern of magnetic polarity in the minerals of ocean bedrock on each side of the Mid-Atlantic Ridge
B
At which location is the temperature of the ocean floor bedrock most likely highest?
C
Beneath which surface location is Earth's crust the thinnest?
East Pacific RIdge
Which block diagram best represents the plate motion that causes the earthquakes that occur along the San Andreas Fault in California?
Transform boundary
Based on the theory of plate tectonics, it is inferred that over the past 250 million years North America has moved toward the
north west
Which element is most abundant in Earthś crust
oxygen
