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